Merge pull request #6184 from dsm054/fix-test-reshape

TST: fix test_reshape.py
DOC: styling clean-up of docstrings (part 2: series and generic.py)
BUG: bug in nanops.var with ddof=1 and 1 elements would sometimes return inf
     rather than nan on some platforms (GH6136)
DOC: add links to other pages to contributing.rst
Merge pull request #6206 from jorisvandenbossche/docstring-numpydoc-cleanup

DOC: styling clean-up of docstrings (part 2: series and generic.py)
Merge pull request #6204 from jreback/var_ddof

BUG: bug in nanops.var with ddof=1 and 1 elements would sometimes return inf rather than nan (GH6136)
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