test_bar_log failure
matplotlib v 1.1.1. maybe i should upgrade?

```
23:57 ~/code/pandas  (master)$ nosetests pandas/tests/test_graphics.py
........F...............................
======================================================================
FAIL: test_bar_log (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/wesm/code/pandas/pandas/tests/test_graphics.py", line 414, in test_bar_log
    self.assertEqual(ax.yaxis.get_ticklocs()[0],1.0)
AssertionError: 0.10000000000000001 != 1.0

----------------------------------------------------------------------
Ran 40 tests in 76.852s

FAILED (failures=1)
```
