Add nginx + thin option and move upload script to Chef library

* Nginx installed from package
* Use thin instead of passeger
* Proper thin upstart job for bundler + thin
* New library upload() for adding files to CloudFiles

### Requires [1cb5286](https://github.com/ryandub/awwbomb/commit/1cb528642f0b7ba9bd1c74a8dad8100a4f688513) in awwbomb.