Update Rails template

- Add Procfile template
- Add builder for future use (can't get it working right now)
- Add Bundler config template
- Update .env template filename so it's not hidden
- Update .travis.yml template filename so it's not hidden
Load new builder and template when creating new Rails projects.
Refactor $RBPATH for the ever-changing versions...
Add heroku alias to Git plugin, refactor others.

- Add `gph`, which pushes the current repo to the Heroku remote.
- Refactor `gpf` so it doesn't always push to 'tubbo' :)...this
  now reads from your github.user property in ~/.gitconfig, which
  is also I believe how Hub knows what to name the remote it
  defines after forking a given project on GitHub.
Upgrade Antigen, refactor Rakefile and add task for Antigen.
v0.6.5: Better Antigen support and Rails template

Fixed some known issues with the Rails template, and began work
on a Rails builder that should make the template a bit smaller
and easier to read, while organizing some of its more destructive
features that are less efficient on the machine.