API endpoint for retrieving collections from Fireplace (bug 901710)
add API endpoint for creating and retrieving collections (bug 894643, bug 894587)
Merge pull request #3 from cvan/collection-create

add API endpoint for creating and retrieving collections (bug 894643, bug 894587)
add API endpoint for retrieving a single collection (bug 894587, bug 896647)
add API endpoint for adding an app to a collection (bug 894639)
add API endpoint for removing an app to a collection (bug 894589)
change name to title
add API endpoint for editing a collection (bug 894585)
add API endpoint for reordering apps in a collection (bug 894591, bug 894638)
accept "carrier" when creating a new collection
add "icon" and "class" to featured collections
show featured apps all the time
rename collection "class" to "layout_type"
Update returned collection_types
add regions + carriers endpoints (bug 863901)