Adding top/left/bottom/right setters/getters + ES5 and mutator for constructor + unit tests
Moving left/right/bottom/top mutator to the very end, since they rely on bounds
docs on node mutator
DOM / text: put the mutator super call first, so that we can initialize there
Reversing mutate calls for bounds-dependent mutators to work on construction
Text default to black fill
Adding centerX/centerY in the same style as left/right/top/bottom
Hello World centered-text example included in documentation