Updated Three.js deck

I updated the "Basics of Three.js"-presentation to work with the latest version of the library. My Google Developer Day "Introduction to WebGL"-presentation is also online, and updated to match the latest changes to Three.js.

In more detail, the changes were:

• $FOO.addChild and $FOO.addLight were merged into a single method, $FOO.add
  
• Camera was deprecated and split into a PerspectiveCamera and OrthographicCamera
  
• Camera no longer has a target that it tracks, you need to use camera.lookAt(vec3) on every frame to accomplish that.
  
• MeshShaderMaterial was deprecated and renamed to ShaderMaterial
  
• material.ambient now needs an AmbientLight in the scene to work (AmbientLight color is multiplied by material.ambient in the shader)
  
• ColladaLoader was renamed to THREE.ColladaLoader