ota: Allow flashing older build over newer one

Change-Id: Ie307af615a0c452c4d34d650bf0ed54cb8824b85
GCC 4.8 for Android & GCC 4.9 for Kernel

Change-Id: I2aa2c2958bf653c03e4bebf2c84cfcd980ebb27a
build: Crush all the PNGs

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

Change-Id: I8f2948fad5711d2eadc376372cbec6e21e0ab509