game_tree. Add render pass end tag to binary game tree.
game_tree. Remove debug print.
game_tree. Require projection node to have all values.

Camera projection must have either 4 or 6 values - for both types of defining projection.
Remove the option to supply only near and far values.
game_tree. Raise an error if camera projection is missing.
game_tree. Fix a bug in camera write.

A type placed a ',' instead of a '.' when checing if the projection is none.
game_tree. Change render pass name to stored in an attribute.

The render pass name used to be stored in the node text.
Changed to store the render pass name in teh xml node name attribute.
collada. Comment out debug code that generates a triangle geometry.
Merge branch 'collada'