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
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
ENH: added numexpr support for where operations
     implemented internals/where in numexpr
BUG: GH3163 fixed to_csv with a boundry condition issue at the chunksize break
BUG/CLN: Exception in HDFStore are now ValueError or TypeError
         A table will now raise if min_itemsize contains fields which are not queryables
Merge pull request #3166 from jreback/GH3163

BUG: GH3163 fixed to_csv with a boundry condition issue at the chunksize break
Merge pull request #3167 from jreback/hdf_error2

BUG/CLN: Exception in HDFStore are now ValueError or TypeError
Merge pull request #3085 from kermit666/patch-3

Resample docstring default values changed
DOC: minor edits in io.rst
SCR: test_perf can save results frame to pickle file, -d
ENH: assert_X_equal with check_less_precise should apply to index/columns too
BUG: Fix the rename for Series and DataFrame, #3165
TST: Test to_csv in more cases and faster
TST: add test for test in test_testing
BUG: check_less_precise in assert_almost_equal with val=float throws exception
DOC release notes add assert_frame_equal checks index and column names
Merge pull request #3172 from jreback/docs

DOC: minor edits in io.rst / cookbook.rst