[Feature request] Install rootfs as a file

What I'd love to see in pmOS is the ability to install the rootfs as a file, for example as /data/pmOS_rootfs.img, so one could flash the pmOS kernel onto the recovery partition and therefore achieve a flawless (well, except lack of recovery), pc-less dualboot with Android.

As far as the implementation goes, I thought about making a pmbootstrap flag, like pmbootstrap install --rootfs-af (as a file of course ), maybe with an additional argument that would let you choose the location (for example /sdcard, or maybe /someObscureLargePartitionThatIsn'tEvenUsed), and of course an argument that would let you pick the size of the rootfs.

The Halium and UBPorts projects already make use of this rootfs style, adding it to pmOS would only give us more versatility :)

Goals:

• pmbootstrap install flag

• ability to set the initial size

• custom location

• an improvement to the init script that would let you place the file on any partition and it would just grep (or smth similar) for it

• ability to resize the rootfs

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• One of Halium install scripts, might be useful