Initial public release
Update README.md
Fix preview orientation changes.
Fix jpeg output orientation.
Remove unneeded code and refactor.
Use API level 21 and fix build errors.
Rotate DNG output and update prebuilt apk.
Implement burst capture.
Abort preview session before capturing.
Implement focus stacking & exposure bracketing.

Code refactor.
Polish UI and finish activity on camera error.
Reuse preview session for capture.

This should fix all the problems with incorrect focus, decrease shutter
lag, and make the UI much more fluid.
Fix auto focus while capturing.
Update README and pre-built apk.
Don't output to preview during burst capture.
Update README.md
Add direct download link to README.md
Update README.md
Add 1/1.2 and 1/16000 exposure time settings.
Close camera after error or disconnection.