[WIP] Implementing docker-based HHVM+Nginx bootstrapper

Todos:

 - [x] create data containers (public dir)
 - [x] share data container with the relevant docker containers 
 - [ ] ~~create test runner containers~~
 - [ ] ~~vagrant provisioning script (minimal)~~
 - [ ] ~~upgrade to ubuntu 14.04 (because.)~~
 - [ ] ~~...?~~