Upgraded ruby version to 2.0.0
Upgraded Ember and Handlebars
Correct versions of Ember RC5 and Handelbars 1.0
Update to sprockets-handlebars_template
Added middleman-ember gem
Update Ember and Ember Data to latest
Changes required by latest Ember, and general cleanup of the minimum required to run PostsApp
Merge pull request #4 from jdjkelly/master

Upgraded to Ember 1.0-rc.6.1, refactored base Ember app, switched to Fixtures for DS, and updated Middleman config