CLN: simplify series plotting
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
COMPAT: change neg of boolean to inv (deprecation in numpy 1.9)
COMPAT: remove deprecation warnings on __new__ (in computation/pytables)
COMPAT: windows dtype fix in for Panel.count
Merge pull request #6981 from pydata/winfix

COMPAT: windows dtype fix in for Panel.count
TST: windows dtype fix for test_pivot (GH6913)
COMPAT: fix array_to_datetime on comparison of NaT
COMPAT: fix warning for slice indexers when using floats in iloc that are convertible
Merge pull request #6960 from jreback/warnings

COMPAT: fix numpy 1.9-dev deprecation warnings in test suite
TST: test_frame/test_sum not comparing correctly on smaller sized dtypes (GH6982)
COMPAT: remove deprecated options from printing in test suite (GH6984)
Merge pull request #6986 from jreback/warnings2

COMPAT: remove deprecated optinos from printing in test suite (GH6984)
PERF: improved performance of compatible pickles (GH6899)
Merge pull request #6983 from jreback/pickle_perf

PERF: improved performance of compatible pickles (GH6899)