Use apipie for documentation
Add missing gem in travis gemfile
Merge branch 'master' into api_doc
Use automatic tool to generate doc
Conflicts:
	Gemfile
	Gemfile.lock
	app/controllers/api/application_controller.rb
	gemfiles/Gemfile
Add good exampels
Merge branch 'api_doc'

Conflicts:
	Gemfile
	Gemfile.lock
	app/controllers/api/application_controller.rb