installer cache + gapps dir

Change-Id: Icd0bc31980ccc1dc67ce86e5c63352ac0c1b9fbf
installer.zip > functional

gapps must be in vendor/pa/prebuilt/gapps/pa_gapps...zip

creates a zipped cache partition image. the image can be installed
via fastboot flash cache cache.img

Change-Id: I053866dd2c557430aec70f22f41da64978b522a5
automatic GAPPS support (via GOO)

stores newest gapps under /gapps and prepares a fastboot packge

Change-Id: Ibc9365124d5bcaf1619c1668e7fdd5578988f363
do not wipe cache before flashing files from it + dalvik

Change-Id: I408f41a7c93d86a602c23f334d47f0dc13814c6a