Change streaming media use case note
removing webrtc use case: webrtc has built-in bandwidth adaptation
More theoretical use cases: Improve battery life and Network based authentication
Cropped and renamed files

Prefixed files with os’s they come from.
Removed some unused screenshots.
Compressed images with imageOptim
Relinked images + small cleanup

Cleaned up the text a little bit, made terminology a bit more
consistant.
Updated tweetbot
Roaming detection theoretical use case
Documented Netflix (closes #21)
Documented Facebook (closes #20)
Documented EverNote (closes #23)
Document pocket (closes #24)
Document android's auto-update of apps (closes #22)
Documented economist on android (closes #26)
optimized images