Bring Ember.literal in as a dependancy

[mike-north]

There's at least one repo that could benefit from Ember.literal, but doesn't want to introduce a dependency on ember-cpm to get it.

adopted-ember-addons/ember-moment#10 (comment)

I broke literal out into its own repo (TrueNorth/ember-literal) and would like to bring it in to ember-cpm as a dependency

[elwayman02]

@mike-north @cibernox is this going to happen?

[mike-north]

@elwayman02 are you running into a problem?

[elwayman02]

@mike-north no problem, just wondering if this is going to be completed or if the issue should be closed.