Only compile dist when, you know, distributing

[ajb]

Figure out how this would work..

[ajb]

Some notes:

• Moving styles from dist/styles to styles is probably a good idea regardless. (They were in dist because of a misconception of how rails-assets works, IIRC.)
• Our tagged refs need to have dist/ present, for Rails Assets

Ideas:

• Maybe move to a develop branch?
• Add a grunt task for moving files from ignored directory to dist/ when actually releasing a version?

[ajb]

Actually, we don't need a develop branch -- we could use a dist branch, and make the tags on that branch.