Added gears environment.
Fit new app settings.
Merge branch 'feature/add-gears-environment' into develop
Modified player.
Modifies files for demo.
Fixed style.
Added quiz and options model.
Added new data record in fixture (quiz and options of quiz)
Add ajax to get and check answer, add a span to show tip after submitting answer.
add view function of checking answer and geting questions and options
hide .tips on each event.
Merge branch 'demo/player' into develop
command two funcs, remove a blank line, remove a useless variable.