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