Support for new spec added.
Merge branch 'master' of github.com:chsc/gogl
Missing constants added.
Readme updates

 - gomake is not used anymore.
 - Wiki links added.
 - MacOS and Windows support works now.
Spec update + GL 4.3 package

 + Package grouping fixed
 + GL 4.3 packages added
Fix for debug callbacks in GL 4.3

- simple func reader fix
Readme updates
New command line interface

- new command syntax (similar the go command)
- README updated
- some go fmt clean ups
Fix enumeration
Merge upstream. Extend function prefix to include extension name.