Added NFS and INNODB.
No need to force hhvm service to start on its own.
Add the HHVM info page to vvv.dev links.
Several systems changes to help speed up the box:

- Add HHVM as an option to a site by adding a single include statement.
- Set NFS as the default shared file store.
- Add INNODB single file/single table to the datafile storage.
- Replace MySQL with MariaDB 5.5 as a drop-in replacement.
Merge branch 'nfs' into git-wp

* nfs:
  Several systems changes to help speed up the box:
  Add the HHVM info page to vvv.dev links.
  No need to force hhvm service to start on its own.
  Added NFS and INNODB.
Git cleanup and move HHVM into config script.
Breaking HHVM pretty good.
Move HHVM install back to the /www/__hhvvvm folder.