Added API support for channels.
Added tests.
Removes Channel subtypes
Formats dates to iso8601
Removes channel subtype
Removes properties and definitions from Component
Updates spec and fabricator
Merge remote-tracking branch 'origin/master' into components

Conflicts:
	app/api/api/v1/entities/channel.rb
	app/api/api/v1/root.rb
	spec/fabricators/channel_fabricator.rb
Updates seeds