Fix typo in Melt section
BUG: dont ignore use_index kw in bar plot
DOC use read_sql rather than read_frame in io.rst
Merge pull request #6211 from Bklyn/doc-fix

DOC: Fix typo in Melt section
BLD: more exception message skipping in @network
BLD/DOC: make.py open file as 'w' rather then 'wb'
BLD/DOC: ip_directive use py3 compat text_type
CLN: typo
Merge pull request #6210 from TomAugspurger/bar-use_index

BUG: dont ignore use_index kw in bar plot
BLD: Cut Travis-CI build times by 30-50%
foo
Merge pull request #6218 from y-p/ironcache

BLD: Cut Travis-CI build times by 30-50%
Revert "foo"

This reverts commit 213593cc5e457d60f70786981d7522ff4a752b3c.
BLD: travis limit ccache to 60M
BLD: travis, skip cache upload when no changes
BLD: travis, reuse cython files if unchanged in last 5 master commits
Merge pull request #6220 from y-p/PR_fast_travis2

BLD: more fast travis
DOC: added references to argmin/argmin API changes to release notes/v0.13.0 relating to GH6214
BUG/TST: groupby with mixed string/int grouper failing in python3 (GH6212)
Merge pull request #6222 from jreback/groupby_py3

BUG/TST: groupby with mixed string/int grouper failing in python3 (GH6212)