Experimental release tools

C457 asked me to help write releasetools for cm12. I don't have a full understanding of everthing that needs to happen and I don't know about the scope of python dependencies for releasetools like this but I modified the standard cm12 ota releasetools to not flash the boot.img to the boot partition and instead copy the boot.img to /system/boot.img

Also disabled block ota's.
Let me know if these suit your needs or if there is trouble with them...