Associate TM with .ttl/.turtle/.sparql file extensionsand use custom file icons

Users can now open Turtle/SPARQL documents in TM right from Finder/Path
Finder. (without having no explicitly select/overwrite it)

I spun off a separate project so that other bundle authors can use it
too: https://github.com/peta/textmate-runner
Delete unused Makefile from textmate-runner