fix the rendering bug by using angular-snap library
Merge branch 'devBrian' of https://github.com/br1anchen/AgoraMobile_sharedWeb into devBrian
fix the switch button text not showing after set content background white
add drawer content border shadow
add hard code way to hide group list elements when the list is too long to fit different size of screen
fix the about page bug with snap.js
fix the notifer bug and angular-snap webkit-scroll-touch bug