WARN: some warnings on mpl 1.5 / windows
this was on 3.5; I couldn't repro on macosx 2.7.

```
In [1]: pd.__version__
Out[1]: '0.17.0+185.g9cbc179'
```

```
[pandas3.5] C:\Users\Jeff Reback\pandas3.5>nosetests pandas\tests\test_graphics.py -v -m area_lim -s
test_area_lim (pandas.tests.test_graphics.TestDataFramePlots) ... C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning s
calar instead, but in the future will perform elementwise comparison
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
C:\Miniconda\envs\pandas3.5\lib\site-packages\matplotlib\collections.py:590: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparis
on
  if self._edgecolors == str('face'):
ok
test_ts_area_lim (pandas.tests.test_graphics.TestSeriesPlots) ... ok

----------------------------------------------------------------------
Ran 2 tests in 2.028s

OK

[pandas3.5] C:\Users\Jeff Reback\pandas3.5>
```
