Merge pull request #4394 from jreback/pi_iat

BUG: Fix .iat indexing with a PeriodIndex GH4390
ENH: ship msgpack as pandas submodule to enable customization for pandas use cases, per #3814 and others
ENH: support for msgpack serialization/deserialization

DOC: install.rst mention

DOC: added license from msgpack_numpy

PERF: changed Timestamp and DatetimeIndex serialization for speedups

      add vb_suite benchmarks

ENH: added to_msgpack method in generic.py, and default import into pandas

TST: all packers to always be imported, fail on usage with no msgpack installed

DOC: added mentions in release notes, v0.11.1, basics

ENH: provide automatic list if multiple args passed to to_msgpack

DOC: changed docs to 0.12

ENH: iterator support for stream unpacking

Conflicts:

	RELEASE.rst

ENH: added support for Panel,SparseSeries,SparseDataFrame,SparsePanel,IntIndex,BlockIndex

ENH: handle np.datetime64,np.timedelta64,date,timedelta types

TST: added compression (zlib/blosc) via big hack

DOC: moved back to 0.11.1 docs

BLD: integrated with built-in msgpack

DOC: io.rst fixes

PERF: update vb_suite for packers

TST: fix for test_list_float_complex test?

PERF: prototype for packing faster

PERF: was still using tolist on indicies

DOC: v0.13.0.txt and release notes

DOC: release notes

PERF: revamples packers vbench to use packers,csv,pickle,hdf_store,hdf_table

TST: better test comparison s for numpy types

BLD: py3k compat