Build a custom nginx based on the bosh release

* Create custom bosh-lite::nginx recipe
  - Use source blobs from cf-release for nginx and the required modules
  - Use modified packaging script to build nginx
  - Use nginx configuration from bosh release
* Extend cleanup to remove chef artifacts from bosh
Merge pull request #159 from sykesm/custom-nginx-build

Bring bosh-lite configuration up to date with recent bosh