Update to latest celmek version
Fix test for new vmath and physics code
Missing inline
More double precision code
Get rid of deprecated fields from hrml loader

The data is now provided by libcelmek.
Harden ac3d loader
Update xcode file
Add atmosphere model (not functional) to celobject
Start json based world loader
Add some notes
Remove dead code
Update celmek
Merge pull request #17 from lorrden/master

General patches