python3.2  offsets.py: TypeError: Cannot cast ufunc subtract input from dtype('<M8[D]') to dtype('<M8[us]') with casting rule 'same_kind'
in pandas.tseries.tests.test_daterange.TestCustomDateRange tests many fail at v0.12.0rc1-90-g4c2d050

```
======================================================================
ERROR: test_repr (pandas.tseries.tests.test_daterange.TestCustomDateRange)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/yoh/deb/gits/pkg-exppsy/build-area/pandas-0.12.0~rc1+git90-g4c2d050/debian/tmp/usr/lib/python3/dist-packages/pandas/tseries/tests/test_daterange.py", line 383, in setUp
    self.rng = cdate_range(START, END)
  File "/home/yoh/deb/gits/pkg-exppsy/build-area/pandas-0.12.0~rc1+git90-g4c2d050/debian/tmp/usr/lib/python3/dist-packages/pandas/tseries/index.py", line 1791, in cdate_range
    tz=tz, normalize=normalize, name=name, **kwargs)
  File "/home/yoh/deb/gits/pkg-exppsy/build-area/pandas-0.12.0~rc1+git90-g4c2d050/debian/tmp/usr/lib/python3/dist-packages/pandas/tseries/index.py", line 180, in __new__
    tz=tz, normalize=normalize)
  File "/home/yoh/deb/gits/pkg-exppsy/build-area/pandas-0.12.0~rc1+git90-g4c2d050/debian/tmp/usr/lib/python3/dist-packages/pandas/tseries/index.py", line 373, in _generate
    index = _generate_regular_range(start, end, periods, offset)
  File "/home/yoh/deb/gits/pkg-exppsy/build-area/pandas-0.12.0~rc1+git90-g4c2d050/debian/tmp/usr/lib/python3/dist-packages/pandas/tseries/index.py", line 1663, in _generate_regular_range
    dates = list(xdr)
  File "/home/yoh/deb/gits/pkg-exppsy/build-area/pandas-0.12.0~rc1+git90-g4c2d050/debian/tmp/usr/lib/python3/dist-packages/pandas/tseries/offsets.py", line 1363, in generate_range
    next_date = offset.apply(cur)
  File "/home/yoh/deb/gits/pkg-exppsy/build-area/pandas-0.12.0~rc1+git90-g4c2d050/debian/tmp/usr/lib/python3/dist-packages/pandas/tseries/offsets.py", line 453, in apply
    time = dt64 - day64
TypeError: Cannot cast ufunc subtract input from dtype('<M8[D]') to dtype('<M8[us]') with casting rule 'same_kind'
```

system info

```
INSTALLED VERSIONS
------------------
Python: 3.2.4.final.0
OS: Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2 x86_64
LC_ALL: None
LANG: en_US

Cython: 0.19
Numpy: 1.8.0.dev-Unknown
Scipy: 0.10.1
statsmodels: Not installed
    patsy: Not installed
scikits.timeseries: Not installed
dateutil: 2.0
pytz: 2012c
bottleneck: Not installed
PyTables: Not Installed
    numexpr: 2.1
matplotlib: Not installed
openpyxl: Not installed
xlrd: Not installed
xlwt: Not installed
sqlalchemy: Not installed
lxml: 3.2.0
bs4: 4.2.1
html5lib: Not installed
```
