PERF: perf regression with mixed-type ops using numexpr (GH5481)
BUG: non-unique ops not aligning correctly
Merge pull request #5482 from jreback/infer_fix

PERF: perf regression with mixed-type ops using numexpr (GH5481)
BUG: fix path reolution in print_versions.py
BUG: print_versions uses path python rather then the invoking python
Merge pull request #5486 from y-p/PR_pr_ver_fixes

Pr pr ver fixes
BUG: print_versions return outside function
DOC: add cookbook entry
API/ENH: pass thru store creation arguments for HDFStore; can be used to support in-memory stores
Merge pull request #5499 from jreback/hdf_args

API/ENH: pass thru store creation arguments for HDFStore; can be used to support in-memory stores
PERF: msgpack encoding changnes to use to/from string for speed boosts
API: disable sparse structure encodings and unicode indexes
ENH: allow msgpack to accept and return string-like objects in addition to files
Merge pull request #5498 from jreback/msgpack_perf

PERF: msgpack encoding changes to use to/from string for speed boosts
BUG: bug in to_msgpack for timezone aware datetime index
BUG: bug in to_msgpack for no freqstr datetime index (GH5506)

TST: msgpack complex test comparisons fixed

API: allow df.to_msgpack() to return a string (no need to specify None for the path_or_buf)
Merge pull request #5507 from jreback/msgpack_bug

BUG: bug in to_msgpack for timezone aware datetime index
DOC: doc corrections basics.rst / io.rst
BUG: Fixed various setitem with iterable that does not have a matching
     length to the indexer (GH5508)
Merge pull request #5512 from jreback/indexing_bug

BUG: Fixed various setitem with iterable that does not have a matching length to the indexer (GH5508)
ENH add cumcount groupby method
DOC add cumcount example to groupby.rst
Merge pull request #5510 from hayd/groupby_cumcount

ENH add cumcount groupby method