ROM Building, Nexus 4, Drivedroid, Rootfs path, Nexus 5 frozen kernel

This moves the rootfs path to the basepwd (root) so that new build do not need to be generated each time.  The main benefit is to save time for having to build rootfs multiple times for each device.  The ROM building is optional for now and it will attach the edify script to the end of ROM's edify script.  Also, it will rebuild kernel by creating a boot.img and sticking back into the ROM.

Nexus 4 initial device configuration still needs testing.

Drivedroid download with build with new cdrom emulation patch.

Updated Nexus 5 frozen with cdrom patch and disable cpufreq gov ondemand.