DOC: add links to other pages to contributing.rst
TST: add tests for algos.factorize (GH6212)
Merge pull request #6231 from jreback/test_factorize

TST: add tests for algos.factorize (GH6212)
Merge pull request #6207 from jorisvandenbossche/doc-contributing-update

DOC: add links to other pages to contributing.rst
BLD: more @network message skipping
BLD: fix travis caching on py3
BLD/DOC: add doc building to travis job. Basically for free
Merge pull request #6233 from y-p/PR_travis_docs

BLD: Build and publish docs (sans API) as part of Travis jobs
BLD: various test_perf fixes
Merge pull request #6235 from y-p/PR_tp

BLD: various test_perf fixes
RLS: set released to True. v0.13.1
RLS: kick off new release cycle
CLN: eliminate doc rst warning
COMPAT: pytables encoding reference invalid in python3.3
DOC: Py2/3 examples compat (datetime, print, StringIO/BytesIO, range)