BUG: Display the legend when calling plot with kind='density'. GH4216
Check if a plotting DataFrame with kind='kde' has a legend. GH4216
Updated release note about GH4216.

BUG: legend was not displayed in `DataFrame.plot(kind='kde')`.
BUG: set name attr in DatetimeIndex and PeriodIndex

Now index names are preserved through slicing
DOC: remove savefig width parameter (#4203)
BUG: initialize DatetimeIndex with array of strings (#4229)
TST: remove fudgy ujson test #4223
TST: force rebuild
BLD: use wheels and newer scipy bc of 33 scipy issue
CLN: replace __repr__ with __unicode__ for string printing (to use StringMixIn)
ENH: implement non-unique indexing in series (GH4246)

DOC: release notes
DOC: Fix typos in CONTRIBUTING.md
BLD: use mpl 1.1.1 in python 2.7 production travis build
BUG: remove six import
DOC: add v0.13.0.txt release notes file (but not to the index yet)
TST: no need for flavor testing in skip

Skip bs4 tests when 4.2.0 is found.
BLD/TST/CI: add script to show skipped tests at the end of a build
TST/BLD: add testing for bad bs4 version
TST: add message to nose.SkipTest
TST: skip if no html5lib since bs4 needs it