NaN when animating rgb() color value

testcase: http://jsfiddle.net/qz5jcoaw/

seems to originate from https://github.com/ded/morpheus/blob/master/morpheus.js#L369

possible fix:

change: (https://github.com/ded/morpheus/blob/master/morpheus.js#L367)

``` javascript
typeof tmp == 'string' && tmp.charAt(0) == '#' ?
```

to:

``` javascript
typeof tmp == 'string' && rgbOhex.test(tmp) ?
```
