Added Dockerfile

[aviau]

Hello!

You have done a good job with PyTox! I plan to use it soon for one of my projects :)

This pull request contains a Makefile and a Dockerfile that will make it really easy for new contributors to get PyTox running within seconds.

For developers, this will make it easy to have a pristine environment everytime you run your tests.

• make run: starts an interactive container with PyTox already installed.
• make test: starts PyTox's tests in a container
• make echobot: starts the echobot in a container.

[Tcll]

can I get a copy of your build, as I can't seem to build it.

EDIT: I just hope it'll work with XP x64

[aitjcize]

@Tcll, I believe he is using Linux

[Tcll]

crap

also, if you can obtain a Win build, please do :)

[aviau]

@Tcll You could run the Dockerfile in Vagrant or inside any VM.

Or something like this: http://docs.docker.com/installation/windows/

[aviau]

@aitjcize Thank you :)