Add three.js app to display collision terrain (will soon generate heightmap)
Have heightmap_generator.js output the heightmap as a file
Generate heightmap on keypress instead of automatically after 5 seconds
Add shaders + shader material

Conflicts:
	heightmap_generator/heightmap_generator.js
Fixed shaders
Fix height map types
Fixed everything.
Merge pull request #423 from virtual-world-framework/generate-heightmap

Generate heightmap