Add '.rbxs' extension for Lua files
COPYING is added to excludes as a file that contains copyright information.
Merge pull request #626 from dzidzitop/patch-1

COPYING is added to excludes as a file that contains copyright informati...
Merge pull request #512 from mark-otaris/patch-1

Add the .rbxs extension for Lua files
Merge pull request #599 from larsbrinkhoff/glsl

Add OpenGL Shading Language.