Ruby: reorganize and refactor

Change-Id: I9383d8e0839ca6b3a94b611868b9e1d33d67aaab
ruby - update ramdisk for wifi

Change-Id: I022be89dab6a601cb9811321615ab8e97f1c4e76
ruby - update sdcard mounting for kitkat

Change-Id: I59d7661501f6663cf1dfc40bccbe369bf836ec66