TODO LIST - Vector should extend Point and be constructable from a Point. - Make sure Polygon is using Vector only when absolutely required (possibly never). - Add simple\common transforms to Matrix. - Test transforming a Polygon with a Matrix. - Evaluate need to replace trig functions in Vector with approximate lookups. - Change non-constructor modules to start with a lowercase letter. - Actors need a z-index. - Actor.update and Actor.init need access to the ActorManager. - JAVADOC ALL THE THINGS!

FUNCTIONAL NOTES - Implement and test everything in 2D now... remember to leave everything flexible for another dimension later.

An Actor
    - has a Matrix.
    - has a bounding box, polygon or circle.... this enough?
    - has a content drawing routine the assumes the actor is drawn from the origin of the stage context.

To Draw an Actor...
    - I apply the matrix to each point in the bounding box and (optionally) draw them to the stage context with an identity matrix.
    - I apply the actors Matrix to the context and render the actor context.

Motion and Physics!
    - Actors have a vector (2 components), velocity (first derivative) and acceleration (second derivative).
    - The vector is updated on each tick by the velocity.
    - The velocity is updated on each tick by the acceleration.
    - Actors have a transformation matrix.
    - The transformation matrix is updated on each tick by the size of the vector.

RESOURCES GENERAL MATH REFERENCE http://chortle.ccsu.edu/VectorLessons/vectorIndex.html#15 http://www.math.oregonstate.edu/home/programs/undergrad/CalculusQuestStudyGuides/vcalc/vcalc.html

DISTANCE FORMULA
http://www.purplemath.com/modules/distform.htm

LAW OF COSINE
http://www.mathsisfun.com/algebra/trig-cosine-law.html

SEPARATING AXIS THEOREM
http://www.codezealot.org/archives/55#sat-convex
http://rocketmandevelopment.com/blog/separation-of-axis-theorem-for-collision-detection/

COLLISION PHYSICS
http://www.metanetsoftware.com/technique/tutorialA.html

CALCULATORS
http://www.mathsisfun.com/algebra/matrix-calculator.html
http://www.mathsisfun.com/algebra/vector-calculator.html

JAVASCRIPT KEY CODES
http://www.cambiaresearch.com/articles/15/javascript-char-codes-key-codes