Small refactor of SwrveGcmIntentService
Refactor SwrveGcmIntentService
Merge pull request #18 from Swrve/SWRVE-7193-ImproveSwrveGcmIntentService

Swrve 7193 improve swrve gcm intent service
Added referrer code
added referrer receiver to demo app
using SwrveHelper.isNullOrEmpty
capture referrer in onResume
minor change to use temp variable
SWRVE-7285 replace DoneHandlerInputStream
Merge pull request #20 from Swrve/SWRVE-4019-Referrer

Added referrer code
Merge pull request #23 from Swrve/SWRVE-7285-DoneHandlerInputStream

SWRVE-7285 replace DoneHandlerInputStream
Merged 3.3.1