ASDoc fix.

Moving class description from constructor's ASDoc comment to the class's one.
ASDoc fix.

Adding information about default value of property castsShadows and fixing ASDoc comment for property animator.
ASDoc fix.

Moving ambientColor property ASDoc comment to the right place.
Changing color spelling to American English (as assumed in this project).
Adding information about default values for specular, diffuse, color, ambient and ambientColor properties.
ASDoc fix.

Fixing @see references.
Add coordinateSystem property to PerspectiveLens.as

Away3D appears to default to a left-handed coordinate system, but other systems (e.g. Alternativa3D, OpenSceneGraph, etc) defaults to a right-handed projection. For compatibility with such systems I have added an option to PerspectiveLens which allows the handedness of the coordinate system to be switched.

The default state of the projection will not be affected by this change.
Fix for TouchManager and stage2d touch issues
BoundingVolumeBase.fromGeometry: prefill min/max values

When a SubGeometry has vertices with x, y or z values in a strict monotonically lower order, the maxX, maxY or maxZ (resp.) would not be set properly, but stay at negative infinity.
AxisAlignedBoundingBox: set aabbPointsDirty on transformFrom

When updateWorldBounds was called on an Entity, it computes the new bounds by calling worldBounds.transformFrom(bounds, sceneTransform), but the aabbPoints would not be updated.
Merge remote branch 'NordMike/master'

Conflicts:
	src/away3d/entities/Mesh.as
	src/away3d/extrusions/Elevation.as
	src/away3d/lights/LightBase.as
	src/away3d/loaders/Loader3D.as
Merge pull request #667 from JohnBrookes/TouchMangerFix1

Fix for TouchManager and stage2d touch issues
Merge pull request #672 from nixn/master

coordinate handling fixes
Merge remote branch 'ChrisDenham/patch-2'
Created enum for lens coordinate system options
Merge branch 'dev'