emberjs/ember-rails — pull request #149 by heycarsten (2013-03-01 19:45:55+00:00)
Title: Ensure rake clean is called before rake dist for install head generator.

If a user has previously used `ember:install --head` and they have not removed `~/.ember` or `~/.ember-data` there is the potential that the next time they run the command, the resulting build will be corrupt in some way. This stops that from happening as it ensures the proper build workflow is followed.