default version of compass

See [Issue 70](https://github.com/empirical-org/quill/issues/70). This fixes `bundle install`, deploy to staging Heroku tested and works. 

It also doesn't touch any other gems so there's not widespread version changes. I did this by updating compass-rails only via `bundle update compass-rails`. Note that `bundle install` will try to get the newest versions of all packages, including bootstrap, which breaks the app.