ENH/DOC: Cleanup docstrings on NDFrame
Merge pull request #5052 from jtratner/update-docstrings-as-appropriate

ENH/DOC: Cleanup docstrings on NDFrame
CLN: clean up tslib.pyx a bit
CLN: skip without np 1.7
Merge pull request #5067 from cpcloud/tslib-unreachable-fixups

CLN: remove unreachable code in tslib.pyx
BUG: Make sure series-series boolean comparions are label based (GH4947)
ENH: Series lhs, scalar rhs bool comparison support