Fix NPE if downloading full ZIP and no starting file present
Split logging into debug-only and informational logging
Added some information logging (always emitted)
Remove dots from 'Flash now' button

The user might think there's a next screen because of these dots, while
flashing starts immediately when the button is pressed.
Spelling correction
Delete old file from /cache if we have a new one to flash
Auto flash ZIPs from /sdcard/OpenDelta/FlashAfterUpdate/ after update
Merge branch 'android-4.4' of github.com:omnirom/android_packages_apps_OpenDelta into android-4.4