fix #14 - Migrate to B3

I migrated everything into B3. Drupal plugin is no longer available, so I removed them.

Submodules:

* org.pex.p2-mirror.repo - create temporary repository for PEX plugins and two externals (smarty and phing). 
* org.pex.p2-mirror.mirror - I'm runing b3 app by tycho eclipserun plugin.