ENH: Create ability to localize tz with data already in that tz (fall transition)
Many times data is already presented assuming a local timezone (e.g., with two hour 1s in the fall dst).  Currently there is no way to localize this data as it raises an ambiguous time error.  Please see the link for an example.

http://stackoverflow.com/questions/17370826/create-pandas-timezone-aware-datetimeindex-on-already-local-timezone

I think many times the simple assumption about the second hour being non-dst is a sound one and should be available.  Perhaps there is already a way to do this, but I have yet to find it.
