Debian specific fixes

- Add wheezy repo to get bundler package which is
  unavailable in squeeze repo
- Get bundler from wheezy repo and de-prioritise all other
  wheezy packages
Add script to test vagrant vm provisioning

- e.g. script/test-vagrant-provisioning squeeze64
Update commonlib
Use official Canonical Ubuntu Precise image

Better source and includes curl
Precise specific fixes

- Get bundler and pdftk from raring repo and de-prioritise all other
  raring packages