add comparisons operator to the Period object and fixes issue 2781
move the Period tests in test_period.py and add assertRaises tests for comparisons
use a function factory for comparisons of Period objects
Bug: Fixed Issue 2993, Incorrect Timestamp Construction by datetime.date and tz.
Added the test case in pandas/tseries/test/test_timezones.py
Resample docstring default values changed

This docstring seems better, since TimeGrouper specifies it [that way][1] too:

[1]: https://github.com/pydata/pandas/blob/master/pandas/tseries/resample.py#L27
Remove confusing default val hints from docstrings
BUG: GH 3106, adding timedelta64[ns] objs to a frame, then consolidating didnt' correctly combine the blocks
BLD: fix cython artifact caching, for fast testing with tox
Merge pull request #3107 from jreback/timedelta

BUG: GH 3106, not combining timedelta64[ns] blocks correctly
BLD: check for BUILD_CACHE_DIR envar in setup.py
BLD: improve test_perf messages
CLN: eliminate py2.5 workaround from setup.py (cython caching)
BLD: more test_perf messages cleanup
Merge pull request #3014 from waitingkuo/fix-timestamp

Bug: Fixed Issue 2993, Incorrect Timestamp Construction by datetime.date and tz
DOC: update RELEASE.rst
BUG: series.plot(kind='bar') should respect pylab color scheme GH3115
DOC: update RELEASE.rst
BUG: incorrect ensure_clean (was ensure_path)
Merge pull request #3116 from jreback/ensure_clean_fix

BUG: incorrect ensure_clean (was ensure_path)
TST: less likelihood of random failing tests