Check that a script name is passed in; avoid segfault
Add edify from android-4.4._r1.1 tag

Copied from https://android.googlesource.com/platform/bootable/recovery.git/+/android-4.4_r1.1
Add plain old Makefile for edify
Add Makefile for edify_checker
Merge pull request #1 from andrewachen/master

Add argument checking and remove ndk/edify dependency