Merge pull request #8 from lorrden/opengl3

Move from OpenGL 2 to OpenGL 3, closing #3
Merge pull request #9 from lorrden/master

Remove GPL exception
Merge pull request #11 from lorrden/master

Updates most function and type names to new coding style
Merge pull request #12 from lorrden/master

Use libvmath from vmath repo in openorbit
Merge pull request #13 from lorrden/master

Integrate libcelmek, closes issue #6 and milestone for celmek integration.
Merge pull request #14 from lorrden/master

Move to double precision physics and scenegraph
Merge pull request #15 from lorrden/master

Fix warnings for suspicious casts
Merge pull request #16 from lorrden/master

Add celmek and vmath as submodules
Merge pull request #17 from lorrden/master

General patches
Merge pull request #18 from lorrden/master

Various changes
Merge pull request #19 from lorrden/master

Add additional submodules
Merge pull request #20 from lorrden/master

Fix warnings and move more stuff to double prec
Merge pull request #21 from lorrden/master

Move to latest stable libcheck and jansson
Merge pull request #22 from lorrden/master

Update celmek and vmath to latest versions