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 
As we discussed, because it looked nicer and is consistent with other packagers. 

We might have to change this in an upcoming PR, but let's do that all at once.