jMath.js 0.0.4: fixes, matrices, obj.equals();

This version includes fixes on faulty functions, more geometric functions, more documentation, and solutions for 2 x 2 matrices which will hopefully pave the way for a solution to matrices in general.
New functions include the equals method, that can be used on any object.
Note: the circumference instances in the ellipse object, don't work yet. Don't use them.