Add 'records' outtype to to_dict method.
Merge branch 'to_dict_records' of https://github.com/tshauck/pandas into tshauck-to_dict_records

Conflicts:
	doc/source/release.rst
DOC: release notes fixup related to GH4936
DOC:  Add isin example to .13 release notes

DOC: Create isin indexing section and link whats new to it

DOC:  Change series.isin example.
Merge pull request #4848 from TomAugspurger/isin_notes2

DOC: isin Example for .13 release notes
BF: import isnull
Merge pull request #5059 from neurodebian/bf-isnull

BF: import isnull