FIX raise when groupby selecting cols not in frame
ENH partial sorting for mi in sortlevel
DOC partial sort for multiindex
CLN: simplify series plotting
BUG: Groupby.get_group doesnt work with TimeGrouper
BUG: Pass args and kwargs to empty
Merge pull request #6953 from TomAugspurger/_apply_empty_result-args

BUG: Pass args and kwargs to empty
BUG: Bug in sum/mean on 32-bit platforms on overflows with non-max dtypes (GH6915)
Merge pull request #6954 from jreback/overflow

BUG: Bug in sum/mean on 32-bit platforms on overflows (GH6915)
ENH: quantiles accept list like

update docs
Merge pull request #6955 from TomAugspurger/quantiles

ENH: Quantiles accepts an array
CLN: remove items/ref_items attributes from Block class

Now, there's one authoritative mapping from BlockManager axis0 to
axis0 of subordinate blocks:

* _blknos[loc] is block number where loc-th item resides
* _blklocs[loc] is location in given block of loc-th item

Blocks support this mapping with blk._ref_locs attributes that
enumerate all items contained in that block.
CLN: rename Block.ref_locs -> mgr_locs to reduce confusion

PERF: add BlockPlacement class to optimize range-like cases

CLN: unify get_slice & take/reindex ops along axis0

TST: add slicing/taking/reindexing tests for BlockManagers

CLN: remove unused code
BLD: numpy 1.9-dev requires cython for installation
Merge pull request #6745 from immerrr/refactor-blockmanager

CLN: revisit & simplify Block/BlockManager, remove axes
Force 64-bit integers to comply with cython buffer specs
COMPAT:  32-bit platform compat for Panel.count
ENH: pivot_table can now accept Grouper
Merge pull request #6913 from sinhrks/pivotg

ENH: pivot_table can now accept Grouper
Boxplot by quartile example code

Add mpl_style option as cookbook currently doesn't have plots