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L-Systems.JS
============
A full, 3D L-Systems implementation in JavaScript. Generates trees by
production rules and draws by converting to cartesian coordinates.
Usage
-----
```js
var lsys = new LSystem('F', { 'F' : 'F-F+FF' });
var tree = lsys.iterate(2);
console.log(tree); // F-F+FF-F-F+FF+F-F+FFF-F+FF
var coords = lsys.draw(Math.PI / 2); // draw tree with alpha as 90 degrees
console.log(coords); // [[0,0,0], [0,1,0], [1,1,0], ...
```
Definition
------
An L-system is a formal grammar defined as an initial axiom string, and a set
of production rules. In the aforementioned example, `F` is the initial axiom,
and only one production rule exists: `F -> F-F+FF`. The grammar alphabet is
assumed to be all characters with a production rule mapping.
Syntax
------
- `F`: draw and move one unit vector forward
- `+`/`-`: turn right / left
- `&`/`^`: pitch up / down
- `<`/`>`: roll right / left
- `|`: reverse vector direction
- `[`/`]`: push / pop current tree state
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