Aargh, I feel dirty now.

This one was quite a pain.

Got stuck on the PathCamera/PathControls one. Maybe it's time to rewrite this...

This will take a while to make work again... probably needs some cleaning and refactoring...

I could have just used `lookAt( scene.position )`, but eventually I would like to have Scene not extending Object3D.

* Camera is now a base object. PerspectiveCamera should be used instead. Figured out a way to show a warning when misused.
* OrthoCamera is now OrthographicCamera.
* Removed `target` from Camera.

Misc
* Renamed Trident to Axes.

Seems like calling `renderer.initWebGLObjects` out of regular frame render doesn't play well with new buffer switching minimization optimization.

Found out that CrosseyedWebGLRenderer probably wouldn't work for target-less cameras.
Something weird going on with `webgl_scene_test.html` and `webgl_scene_test_blender.html`. For some reason cubes dissapear.

Removed QuakeCamera.

Implemented .autoClearColor .autoClearDepth .autoClearStencil as per @alteredq's suggestion at #587.

* Camera.useTarget is now false by default. Updated some of the examples. I tried to remove target altogether (and use lookAt every frame), but I found that WebGLRenderer's ShadowMaps uses a camera with target. Will try again at some point.
* Object3D.lookAt now checks if it's a Camera and does the inverted view.
* Quaternion glitch reported at #595
* Added .name to Material
* WebGLRenderer .clear() to .clear( color, depth, stencil ). All of them true by default.

Fixed mergeVertices(). Moved from CubeGeometry to Geometry. Now checkDupVertices(true) removes duplicated vertices

New stuff:

- car rig
- dynamic cube maps
- drop shadows from geometries
- tilt-shift
- motion blur
- fxaa

Uses shrunk lens flare texture from ro.me.

Rename SubdivisonGeometry.js to SubdivisionGeometry.js. Fix geometries which use duplicate vertices. SubdivisionGeometry tested with Cube/Sphere/Cylinder/TextGeometry

Works better in OpenGL with thick lines. Single pixel wide lines in ANGLE get a bit of strip pattern.

Should not refresh anything if material doesn't change for several objects in a row (in a single frame).

Hope this didn't break something, I remember this being tricky. Went through examples and they seem to work ok, gained some fps in performance test.

Also disabled sorting in depth-of-field example for some more fps gain.

Still didn't figure out the original reason for recent fps drop in performance / dof examples :/

Added ability to disable render passes to EffectComposer. Added simple blend shader to ShaderExtras.

Hopefully this fixes several problems:

- ambient component not modulated by scene ambient light
- specular component not getting light colors
- unnecessary opacity use in lighting calculations
- unnecessary vertex shader light computation for Phong
- unnecessary use of one varying in Phong