[Pending review] Zeus

What's needed (requirement, and the solution)

- [x] Fast `rake`: Run `zeus start` && `zeus rake`
- [x] Fast `rails s`: Run `zeus start` && `zeus s`
- [x] Fast `rspec`: Run `zeus start` && `zeus rspec spec`
- [x] Fast `cucumber` with Firefox: Run `zeus start` && `zeus cucumber`
- [x] Fast `cucumber` with Phantom hack: Run `PHANTOMJS=true zeus start` && `zeus cucumber`
- [x] Guard watches RSpec: Run `zeus start` && `guard`
- [x] Guard Livereloads browser: Run `guard`, open browser and do your thing
- [x] Zeus reload when needed: Seems that Zeus can restart itself when needed (tested by modifying factories.rb and community.rb)

Make sure that:

- [x] Travis tests pass