Created Array data transform

Now its possible use DS.attr('array') as a attribute for models.
This is used to pass the repetitions in the RESTAdapter.
Added the build/index.html

Removed in the gitignore the entry to ingore the build/index.html file
and build folder. Now anyone can run this application.
Solved problem with empty JSON as reponse from API

Now the serializer return a empty array when the API.

When the list
Merge pull request #23 from MateusZitelli/wip/ember_migration

Some bugs solved