DEB packagers, no FPM, oh my!

This PR does the following:

1. Implements our own DEB packager
2. Removes FPM as a dependency (and related code)
3. Performs some various cleanup of inconsistency between packagers

/cc @opscode/release-engineers 
This comment is misleading. The package name can in fact contain underscores. It's the project name bit of the overall package name that can't.