What's new in 0.4:

*) dandelion model;
*) bigger spruce model;
*) renderman RIB exporter (works with pixie);
*) changed "DCM -> euler angles" code;
*) collada scene scaling by 0.05;

What's new in 0.3:

*) renamed scale rule to radius;
*) fixed leaf transparency;
*) replaced doubles with floats;
*) fixed "rip" rule;
*) improved rotation code;
*) fixed turtle aligning to horizon;

What's new in 0.2:

*) more examples;
*) improved branch drawing code;
*) povray "point of view" saving;
*) collada exporter (works only for blender);
*) branching texture coordinates can be calculated from branch radius;

What's new in 0.1:

*) use cl-opengl instead of cl-sdl-opengl;
*) put SDL stuff in machine.c to avoid using cl-sdl;

What's new in 0.0:

*) everything;
