TST: add parallel connection stress test, move to grequests
TRAVIS: install grequests only on python2
TST: fix tests contention on ports making test fail
TOX: cleanup
TRAVIS: allow failure with PYTHONWARNINGS="d"
DOCS: update README.md with news on IPython's roadmap
BUG: disable websocket tests, ws4py causes segfaults on 3.3
TST: moar ObjectRegistry tests for short keys
DOC: update README
CLN: add server.stop() to examples