Timezone Conversion Bug
It seems that it is not possible to use static timezones with pandas:
http://nullege.com/codes/search/pytz.tzinfo.StaticTzInfo

``` python
pandas.DatetimeIndex([dt(2012, 1, 1)], tz=pytz.timezone('EST'))


---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-483-37a722361cf0> in <module>()
----> 1 pandas.DatetimeIndex([dt(2012, 1, 1)], tz=pytz.timezone('EST'))

/usr/lib64/python2.7/site-packages/pandas/tseries/index.pyc in __new__(cls, data, freq, start, end, periods, copy, name, tz, verify_integrity, normalize, **kwds)
    224             ints = subarr.view('i8')
    225 
--> 226             subarr = lib.tz_localize_to_utc(ints, tz)
    227             subarr = subarr.view(_NS_DTYPE)
    228 

/usr/lib64/python2.7/site-packages/pandas/lib.so in pandas.lib.tz_localize_to_utc (pandas/src/tseries.c:38322)()

/usr/lib64/python2.7/site-packages/pandas/lib.so in pandas.lib._get_transitions (pandas/src/tseries.c:37001)()

AttributeError: 'EST' object has no attribute '_utc_transition_times'
```
