#192: added Token model, migration, controller
#192: updated views
#192: updated tokens_controller, added token.ru.yml
#192: updated translations, views
#192: added specs for model
#192: added request specs
#192: some refactoring of views
#192: added ability to change visibility of platform
#192: updated cancan_spec, added tokens to urls of repositories for build_list
#192: added #allowed action to Platform API
#192: misprint
#192: added specs for Platforms API
#192: updated controller and specs of Platform API
#192: added new specs, some refactoring of controller
#192: refactoring of controller according to Alexander's comments
Merge branch 'master' into 192-hidden-platforms-and-tokens
#192: merge master into branch
#192: updated API platforms controller
#192: removed #puts
#192: rescue errors