BUG: fixed .abs on Series with a timedelta (partial fix for 2957)
keep name after DataFrame drop, add check_name to assert_dataframe_equal
default check_names to True, and fix calls where this is problematic
BUG: handle single column frame in DataFrame.cov
BUG: HDFStore didn't implement != correctly for string columns, GH 2973
Merge pull request #2976 from jreback/pytables_select

BUG: HDFStore didn't implement != correctly for string columns query, GH #2973
TST: pathological objects cause infinite loop when passed to pprint_thing
BUG: pathological objects cause infinite loop when passed to pprint_thing
BUG: Series.argsort failing on datetime64[ns] when NaT present, GH #2967
Merge pull request #2977 from jreback/argsort

BUG: Series.argsort failing on datetime64[ns] when NaT present, GH #2967
Merge pull request #2958 from jreback/timedelta_2957_new

BUG: fixed .abs on Series with a timedelta (partial fix for 2957)
TST: fix test on python3
BUG join with missing values on right (GH_2843)
Merge pull request #2965 from hayd/iss2843-left-join-on-na

BUG check both left and right indexers for None (fix 2843)
Merge pull request #2962 from hayd/issue2939_drop_loses_name_2

BUG keep name after DataFrame drop, add check_name to assert_dataframe_equal
BUG: Bug in idxmin/idxmax of ``datetime64[ns]`` Series with ``NaT`` (GH2982_)
     refactor in core/nanops.py to generically handle ops with
       datetime64[ns]/timedelta64[ns]
     Series.argsort to always return int64 dtype (and ignore numpy dtype on ints)
     minor doc update in io.rst (pytables)
Merge pull request #2985 from jreback/idxmin

BUG: Bug in idxmin/idxmax of ``datetime64[ns]`` Series with ``NaT`` (GH2982)
ENH: add .loc attribute to provide location-based indexing

TST: added multi-index tests

DOC: changed loc -> iloc
     added more docs

ENH: added integer lists as indexers to iloc

ENH: raise correctly on out-of-bounds slicing
     support negative indexing in iloc and icol

CLN: move all indexings (ix/iloc) to PandasObject in generic.py
     (except _SeriesIndexer in series.py)
     add name parameter to Indexer creation, makes indexers independent
     of their external names
TST: new test suite for indexing
ENH: added loc/at/iat indexers ....almost done