added Scrollbar Func in list area

Done:
 - added scrollbar in music list & play list
bug fix in scrolling

Done:
 - modified margin length
 - erase useless class
Merge branch 'develop-front-end' into integration-v1
FB Auth Test

Done:
 - Login Button in nav bar

Todo:
 - FB Auth Testing in Server
Infinite Scrolling Fn added

Done:
 - infinite scrolling available now in play list & music list
Logout Fn added

Done:
 - logout function

Bug Fix:
 - improved delay time when infinite scrolling occurs
Modified login fn

Done:
 - modified login ux from wide html to modal
Keypress Fn added

Done:
 - client ready to query to server
Merge branch 'develop-front-end' into integration-v1
Merge branch 'midi' into integration-v1

Conflicts:
	app/index.html
	app/lib/midi/pancakeplayer.js
	app/pancakeplayer.css
	app/scripts/app.js
	app/scripts/controllers/playlist.js
Integration with midi
fancymoves removed and plaslider controller separated from app.js