True Colors

Now stores color along with UIBezierPath for drawing in multiple colors.  The `paths` NSArray now contains tuples of UIBezierPath and UIColor like so:

```
[
    [ path, color],
    ...
]
```

Modified the example code to include a very simple color toggle.

closes #3



note - the Pods directory needs to be removed from the repo but I'm going to submit another pull request for that with mods to .gitignore to fix this.