FIX raise when groupby selecting cols not in frame
ENH partial sorting for mi in sortlevel
DOC partial sort for multiindex
API: add is_beg_month/quarter/year, is_end_month/quarter/year accessors (#4565)
DOC: add notes to the groupby.rst docs
Merge branch 'master' of https://github.com/mikebailey/pandas into mikebailey-master
BUG: parser_source as a filename with non utf-8 encoding in Windows filesystem (GH6807)
BUG: duplicate indexing with iloc
Merge pull request #7006 from jreback/iloc_dups

BUG: duplicate indexing with setitem with iloc (GH6766)
BLD: fix failing vbench cases
BLD: travis changes forced system site-packages now unavailable
BLD: fix nose version at 1.3.0 to avoid py3 issues
DOC: add notes to the groupby.rst docs
Fix for GH 6885 - get_dummies chokes on unicode values
Merge pull request #7008 from immerrr/fix-failing-vb-suites

BLD: fix failing vbench cases
BLD: add python 3.4 build on travis

BLD: remove statsmodels from 3.4 build

BLD: allow pip/setuptools to work on latest versions

BLD: install nose from master on EXPERIMENTAL builds
Merge pull request #7009 from jreback/python3.4

BLD/TST: Python3.4 testing via travis
BUG: fixing tseries plot cursor display, resolves #5453
Added selection example to cookbook

I added a (for me) very helpful Q&A from Stackoverflow on groupby/minimization while retaining the original DataFrame columns. Additionally, I cleaned up some links in the same cookbok section.

(Disclaimer: this is my first pull request.)
Merge pull request #7012 from ojdo/patch-1

Added selection example to cookbook
DOC: cookbook.rst corrections