Release version 2.0

A complete rewrite of the application for v2!

I've rewritten it as a Symfony Console application. This gives us better support for future tools, better help text, and better error handling. Dev dependencies are now managed by composer, and I've added some basic Travis testing.

In addition, the application is now deployed as a single .phar archive from the ./bin folder. You only have to composer install if you're planning on doing development.