added exposure mode helper
fix for emergent flash post-selfie mdoe
locking exposure during shots
clarified auth failure message
fix to dismiss view controller when deleting final image
removed weird strongSelf artifact
consolidated serial queues

Conflicts:
	Lomo41/LoAppDelegate.h
	Lomo41/LoAppDelegate.m
	Lomo41/LoCaptureViewController.m
one serial queue fix