Update to latest ember-dev.

`ember-dev` has been updated to only include `bundler/gem_tasks` when
actually releasing a gem.

`ember-dev` now uses the dasherized project name (from `ember-dev.yml`)
for the generated spade file. This allows us to test multiple projects
at once without having a naming collision on `ember-spade.js`.

I also updated `ember-source` to 1.1.1 (latest stable).
Merge pull request #48 from rjackson/update_to_latest_ember-dev

Update to latest ember-dev.