Changed grunt development server port to 9003 to combat common port collisions with other applicaitons

`9000` is a common port used by various applications. In order to prevent port collisions, I switched the grunt development server to port `9003`.

Some common collisions which can be foreseen occurring on port 9000:
xdebug on Eclipse
xdebug on Sublime Text
xdebug on NetBeans
xdebug on PHPStorm
... basically any IDE with xdebug integrated.
[play framework] [1] runs on port 9000

The internet is riddled with why can't I use `X` on port 9000. Let's avoid that head ache.

[1]: http://www.playframework.com/