Automate pushing from GitHub to wordpress.org SVN repo

[stevector]

This work can follow pantheon-systems/solr-power#15

[danielbachhuber]

@stevector Thoughts on how we can overcome this issue?

Furthermore, I've run into race condition problems on Travis which has meant an old, slower build deploys over a newer, already completed build.

[soderlind]

I'm using grunt, works evrytime, here's one of my Gruntfile.js files