Do not convert series when looking at sub-daily frequencies.
TST: Skip hist testing for matplotlib <= 1.2

Add skip to the hist test

Add to release notes
TST: Add test for get_data_google dtypes
Merge pull request #8810 from onesandzeroes/mplskip

TST: Skip hist testing for matplotlib <= 1.2
Merge branch 'issue3995' of https://github.com/dstephens99/pandas into dstephens99-issue3995

Conflicts:
	doc/source/whatsnew/v0.15.2.txt
Merge branch 'infer_freq' of https://github.com/rockg/pandas into rockg-infer_freq

Conflicts:
	doc/source/whatsnew/v0.15.2.txt
Fix unrecognized 'Z' UTC designator
Merge branch 'fix-z-designator' of https://github.com/broessli/pandas into broessli-fix-z-designator

Conflicts:
	doc/source/whatsnew/v0.15.2.txt
Revert "Fix unrecognized 'Z' UTC designator"

This reverts commit 0e02d5f275234b11d699ce13aa4da4f3624d0f7d.

Conflicts:
	doc/source/whatsnew/v0.15.2.txt
DOC: Added get_group subsection