jem: use unified releasetools

Change-Id: I7cf223643ea06ca7fe575881c01d52da5b09e7f5
jem: remove local releasetools

Change-Id: I3d91c290f977646d416194c6fd433a57153af053
jem: remove common overlay items

Change-Id: I4d111fc0ae04f42000e4a6b71430a6b697102ff8
jem: set video_size prop to 1280x720

Change-Id: I31bf5876bc9283000651f3ced4d1cb590203cdc2
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_amazon_jem into cd-4.4