README fix

Newlines in Markdown don't actually insert new lines in the output (well, not without explicitly forcing them with two spaces at the end of the line).  But this is probably intended to be an unordered list anyway.
Merge pull request #1118 from tjschuck/patch-1

README formatting fix
Update ember-dev.
Merge pull request #1126 from rjackson/update_ember_dev

Update ember-dev.
Use new ember-dev asset structure.

See https://github.com/emberjs/ember-dev/pull/24 for full details.
Merge pull request #1127 from rjackson/use_new_published_structure

Use new ember-dev asset structure.
Update ember-dev to allow for stable builds.
Merge pull request #1130 from rjackson/allow_stable_builds

Update ember-dev to allow for stable builds.
Fix typo
Merge pull request #1131 from hrysd/typo

Fix typo