Installed RABL gem
added oj gem
Rabl configuration
Updated provider_partial and partial_exists? helper methods, added provider_rabl_view helper method
rabl provider application views
Removed unnecessary attributes, as_json methods from provider_application models
Added uptime to OpenStack provider application
Added uptime and humanized_memory to ovirt provider application
Removed attributes method and serializers dependency from launchable model
Updated tests and removed attributes method testing