Export the RaySphereIntersector class from ludum.js

Forgot to add that line in the previous commit.
Remove the 'samurai' font

I wasn't using it...
Chaange the font to something more futuristic.

The new font was created by Style-7 (http://www.styleseven.com/).
Add some textures.
Load & use textures, change fonts, etc.
Remove the unused (but very lovely) ArabDances font
Turn shadow mapping back on
Add a basic skydome.
Change the fog colour, it looks much cooler now!
Fix a typo in the ray-box intersection code
Stop the player walking through things
Moved the blender file into a subdir
Add extra blender autosave extensions to the gitignore
Add crosshairs.
Hide the mouse cursor.
Add the source for the crosshairs icon
Ignore some extra files I'm keeping in case they come in useful later.