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
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
Merge pull request #3120 from jreback/hdf_travis

TST: less likelihood of random failing tests
TST: test for GH2623, object in frame upconverting a datetime64[ns] in another column
BUG: GH2817, raise the correct KeyError that the multi-index is not sorted
BUG: HDFStore bug when appending to a table, .typ not recreated on 2nd appends
      when min_itemsize is specified it caused an Exception
BUG: GH2719, fixed reshape on a Series with invalid input
Merge pull request #3126 from jreback/hdf_bug

BUG: HDFStore bug when appending to a table, .typ not recreated on subsequent appends
Merge pull request #3127 from jreback/reshape

BUG: GH2719, fixed reshape on a Series with invalid input