Bash script for unix / OSx variant of Asset Grabber

This is a change against Issue #2 -- Stripping and Translating assets from the Mordor sources.

This pulls all of the relevant data off of a mounted Mordor Iso and drops it in the asset directory.

We could maybe do a little better wrt. global variable ($MORDOR_ROOT), but I don't know how to make that work in windows and OSx and Unix at the same time.