API: Timetamp.tz_localize and tz_convert raises TypeError rathar
Merge pull request #8036 from sinhrks/tz_except

API: Timetamp.tz_localize and tz_convert raises TypeError rathar
Update README to use pydata instead of pystatsmodels google group

I'm pretty sure PyData is the main mailing list for pandas now, e.g., as seen on the website:
http://pandas.pydata.org/community.html
Merge pull request #8047 from shoyer/patch-1

Update README to use pydata instead of pystatsmodels google group
BUG: stack with datetimes

Just take from index itself, not levels.
TST: catch invalid options data parsing
Merge pull request #8053 from jreback/test_data

TST: catch invalid options data parsing
BUG: Bug in DataFrameGroupby.transform when transforming with a passed non-sorted key (GH8046)
Merge pull request #8043 from TomAugspurger/stack-datetime

BUG: stack with datetimes
Don't call np.roll on empty arrays.

On some versions of numpy (such as 1.7, but not 1.8), this throws a
ZeroDivisionError.

Fixes #8019.
Merge pull request #8049 from jreback/transform_order

BUG: Bug in DataFrameGroupby.transform when transforming with a passed non-sorted key (GH8046)
Merge pull request #8041 from ahlmss/slice_empty

BUG: Don't call np.roll on empty arrays.
PERF: StataReader is slow due to excessive lookups for missing vales

Previous versions of StataReader did not correctly check for missing values.
This was fixed in a previous PR, but these checks had previously been
implemented on a value-by-value basis.  This has now been changed to a
vectorized version that is orders of magnitude faster.

Adds support for preserving Stata missing values when importing data using
the convert_missing argument.  When True, missing values will be returned as
StataMissingValue objects.  Test cases for missing value conversion have been
included.

Additionally, a benchmark was added to monitor performance issues in the
future.

Closes #8040
Merge pull request #8045 from bashtage/stata_unpack_performance

PERF: StataReader is slow due to excessive lookups for missing vales
TST: Fix converter test for MPL1.4