ota: Allow flashing older build over newer one

Change-Id: Ie307af615a0c452c4d34d650bf0ed54cb8824b85
build: Crush all the PNGs

Refactored CM's opticharger to match with Paranoid build system.

Change-Id: I8f2948fad5711d2eadc376372cbec6e21e0ab509
Bump to GCC 4.8

Change-Id: I3270f9e9ef2491cbc9f5acbb81f7bdda9d98e952