Make sdcard (internal) primary storage

Change-Id: I03906f91181ad69d92f829e363be20ac8533fea8

Conflicts:
	common.mk
Switch to mtp as default rather than mass storage

Depends on http://review.cyanogenmod.org/#/c/35193/
Otherwise the USB notification will not display.

Change-Id: Idc66d5c83a18e283545ca296c8870d5d1c71f1bb
Add pds backup and loop mount script