DOC: remove savefig width parameter (#4203)
BUG: set name attr in DatetimeIndex and PeriodIndex

Now index names are preserved through slicing
Merge pull request #4233 from cpcloud/fix-index-slicing

BUG: Index removes name when sliced
Merge pull request #4217 from jorisvandenbossche/doc-plots

DOC: remove savefig width parameter (#4203)
ENH: allow layout for grouped DataFrame histograms

Also remove the slow decorator for tests that take < 100 ms time
BLD: check to see if cephes even exists