Vagrant setup with dev tools

**This patch provides**
* vagrant setup at http://192.168.108.102/
* dev tools (phing, phpunit, symfony cli setup with doctrine bindings)
* seed data for multisite vanilla WordPress (through `phing seed-install`)

**Status**
* partial dev-tools
* missing phing-setup
* missing symfony setup
* missing doctrine bindings
* missing seed data
* missing wordpress-ms adjustments