Integrated FrontEnd with Parse.
Merge remote-tracking branch 'origin/fetch_friend' into fetch_friend

Conflicts:
	app/src/main/AndroidManifest.xml
	app/src/main/java/edu/cmu/fairshare/activity/TripDetails.java
	app/src/main/java/edu/cmu/fairshare/activity/TripDetailsEditActivity.java
	app/src/main/java/edu/cmu/fairshare/adapter/ViewTripAdapter.java
Integrated friends list with the entire app.