Fix gevent monkey patching.

Fix applied to gevent, fastgevent & geventwebsocket backends.
Merge pull request #62 from Awingu/fix-gevent-patch

Fix gevent monkey patching
Added Python 3.4 and PyPy to the build.
Added Python 3.4 and PyPy to tox.ini.
Merge pull request #63 from thedrow/patch-1

Added Python 3.4 and PyPy to the build
Add tornado backend.
tornado.netutil.bind_unix_socket() removes existing socket.
fix flake8
Fix test_server
Fix travis and tox
Fix potensial attribute error.
Support Tornado's TCPServer and web.Application.
Fix bug.
Add example for tornado.
Fix flake8 error.
Fix gevent monkey patch is applied for non gevent servers.
Fix tests.
Show Python version before running test.
Wait for server starts.
Install coverage befor running coveralls