file chnages, add sepolicy

...

 Changes to be committed:
	modified:   BoardConfig.mk
	deleted:    README.md
	modified:   device.mk
	modified:   gps.conf
	modified:   init.tuna.rc
	modified:   kernel
	deleted:    recovery_keys.c
	new file:   sepolicy/file_contexts
	new file:   sepolicy/genfs_contexts
	deleted:    vold.fstab