Add coveralls.io configuration

This is supposed to work automatically. Hopefully, I don't need to put
the repo token into version control. It is supposed to remain a secret.
Move 'db:setup' rake task to travis script

The `RAILS_ENV` variable needs to be set and apparently this doesn't
work right when it is run as a dependency.
Add repo status badges for different sites

  - build status: travis-ci.org
  - code smell rating: codeclimate.com
  - test coverage: coveralls.io
  - dependency status: gemnasium.com
Merge branch 'repo-badges'