Provide port to Python 3 about th2c

[harryf]

The current version of Redhat - RHEL 7 - which most banks, large enterprises etc. comes with a system python version of 2.7.5 and you need to jump through hoops to install Python 3.x ( e.g. https://stackoverflow.com/questions/8087184/problems-installing-python3-on-rhel )

[vladmunteanu]

Thanks for submitting this issue @kin5 !
Indeed, supporting Python 3 would be nice and that's the plan in the following weeks.

Tornado 5.0 has also been released and it has brought improvements regarding compatibility with asyncio.
(http://www.tornadoweb.org/en/stable/releases/v5.0.0.html).

In case you want to have a go at it yourself, pull requests are appreciated!