ENH: Import testing into main namespace.
DOC: clarify docstring of rolling/expanding moments

- document center argument
- add note about the result set at right edge by default
- clarified freq keyword a little bit
DOC: fix doc build warnings
FIX: hdfstore queries of the form where=[('date', '>=', datetime(2013,1,1)), ('date', '<=', datetime(2014,1,1))] were broken
- modified Expr.parse_back_compat to check for tuples, in w, and unpack into w, op, value
- modified Expr.__init__ to modify the where list/tuple with the parsed result
added test by taking test_term_compat, and removing all Term calls
DOC: added release note about #6313
TST: checked for DeprecationWarning on tests for backwards compatability logic
BUG: Bug in Series.get, was using a buggy access method (GH6383)
CLN: Change assert_(a is [not] None) to specialized forms

Work on #6175. Changes instances of assert_(a is [not] None) to specialized assertIs[Not]None(a).
Merge pull request #6385 from jreback/get_bug

BUG: Bug in Series.get, was using a buggy access method (GH6383)
Merge branch 'pytables_backwards_compatability' of https://github.com/hhuuggoo/pandas into hhuuggoo-pytables_backwards_compatability

Conflicts:
	doc/source/release.rst
Merge pull request #6386 from bwignall/assert_6175_newAsserts_3

CLN: Change assert_(a is [not] None) to specialized forms
CLN: Specialize assert_(np.array_equal(...))

Work on #6175. This is the third (and final) "half" of the work started in #6368.
BUG: Bug in DataFrame.dropna with duplicate indicies (GH6355)
Merge pull request #6388 from jreback/dups_dropna

BUG: Bug in DataFrame.dropna with duplicate indices (GH6355)
DOC: add cookbook example for reading in simple binary file formats
Merge pull request #6390 from cpcloud/cookbook-read-bin-6305

DOC: add cookbook example for reading in simple binary file formats
Fix behavior of `to_offset` with leading zeroes

Currently, `pandas.tseries.frequencies.to_offset` erroneously returns a zero time offset when the first part of its argument has a numerical value of zero, even if later parts have nonzero values.  For instance,

    In [123]: pandas.tseries.frequencies.to_offset('00H 00T 01S')
    Out[123]: <0 * Days>

In this patch the sign check is applied before conversion to `int` in order to support offsets like `'-00H 00T 01S'`.
API/CLN: add in common operations to Series/Index, refactored as a OpsMixin
         (GH4551, GH4056, GH5519)
TST: Add tests for `to_offset` with leading zeroes

Test for the issues fixed by cbc8c73fdf617a4644baa130dff05476c7a61645.