Frustum.contains -> intersectsObject, containsSphere->intersectsSphere, removed Frustum.containsAnyPoints, .transform.  Update unit tests accordingly.

Conflicts:
	src/math/Plane.js

Now with the CSS3DRenderer it has become irrelevant.

Renamed .multiplyMatrix* to .applyMatrix* and .multiplyQuaternion to .applyQuaternion as suggested by @WestLangley in #2860.

Makes the code so much nicer imho...

Fixed inconsistent precision for lensflares and sprites shaders causing troubles on mobile (thanks to @phoboslab).

See #2769

always use local var planes = this.planes in Frustum. fix common include to require Sphere before Frustum.