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 
`rpmbuild` uses ant-style globbing, so it'd want `**/.gitkeep`.  Also, we might want all of these to be prefixed with `**/` to make sure we exclude `.git` directories in subdirectories.