Updated uncramfs_all.sh to check for openrg images first. Updated extract-ng.sh and build-ng.sh so they can be run from other directories.

git-svn-id: http://firmware-mod-kit.googlecode.com/svn/trunk@377 5c1471b0-2a1b-0410-b4f4-f33460ac40b9
git-svn-id: http://firmware-mod-kit.googlecode.com/svn/trunk@378 5c1471b0-2a1b-0410-b4f4-f33460ac40b9