added manual focus/exposure/whitebalance

have added manual settings in config.plist and implemented in
camviewcontroller using new iOS 8 apis. haven’t exposed these settings
to the settingsviewcontroller yet. added swipe gestures on
camviewcontroller to adjust focus/exposure. removed exposure setting
flash.
finishing manual camera settings
fixed image review bug, removed AWS
Merge pull request #6 from UCBerkeleyCellScope/manualcontrol

Manualcontrol merge to master