Value-support issues on reset and dirty detection
Value-support issues on reset and dirty detection

- Fixed dirty detection for arrays that are now backed by a seperate
array
- Reset should use _setupValue() to properly reset (ember-data relations
are backed by our own array)
- Fixed _setupValue() to correctly compare values
ember-furnace/ember-cli-furnace-forms,ember-furnace/ember-cli-furnace-forms