Added GPS listener.

Updated manifest for GPS location tracking
Added GPS string to challenge model
Deleted redundant out prints in ChallengeCreateActivity
Merge remote-tracking branch 'origin/master' into Kevin

Conflicts:
	AlmendeMotivator/src/alm/motiv/AlmendeMotivator/ChallengeCreateActivity.java
	AlmendeMotivator/src/alm/motiv/AlmendeMotivator/models/Challenge.java
Merge remote-tracking branch 'origin/Kevin'

Conflicts:
	AlmendeMotivator/src/alm/motiv/AlmendeMotivator/ChallengeCreateActivity.java
	AlmendeMotivator/src/alm/motiv/AlmendeMotivator/models/Challenge.java