Bounded was brought over from the weave library since weave is being
eliminated. Also, at some point along the way, rust 1.43.0, f32 and
f64 started defining NaN, so now we are using the compiler definitions.
This complete what is needed for the definition of Vector2, Vector3, and Vector4.
This required a trigonometry section, fleshing out the rest of the Number, ToNumber,
and FromNumber section, correctly defining all the available function for the Real
trait, and defining several constants.
