BillyJack's simple leather mods.

This patch applies BillyJack's simple leather mods to all tilesets:

    http://dffd.wimbli.com/file.php?id=8107
    http://www.bay12forums.com/smf/index.php?topic=132489.0
Added a patch-graphics-from-master.pl

This script makes it easy to take changes from the master raw
directory, and apply it to all the graphics sets on an as-needed
basis.

It's mostly to make my life easier. :)
Updates to Billy Jack's leather 12 Nov

- Fixed an issue with drake scales being tanned
- Fixed Balrog and Dragon Raptor entries appearing as leather types
Distribute simpler leather patches across all tilesets.

See: http://www.bay12forums.com/smf/index.php?topic=133174.msg4763817#msg4763817
Merge branch 'simple-leather'

Merging into master as simple-leather is now part of the upstream 4d
release.

* Rebased simple-leather on upstream commit:
     'creature_birds.txt and creature_subterranean.txt files
     now use APPLY_CREATURE_VARIATION.'
  This simplified conflicts from this having been cherry-picked over.

Conflicts:
	MasterworkDwarfFortress/graphics/patch-graphics-from-master.pl