Differentiate message urls with color and show a hover state on the children

Hi Maurice!
    I use the console a lot for debug and I've been having trouble differentiating between the js links. Especially when hovering (this a problem on default chorme as well, not just this css). I've customized the console message children slightly to show more of a differentiation. I've attached a screenshot showing the change and it shows one of the message children with hover as well.

I haven't changed the other css as I don't have Canary to be able to test it...

![screen shot 2013-07-17 at 10 46 39 am](https://f.cloud.github.com/assets/730594/812916/27a0d5b4-eef8-11e2-98ba-b645d7cc3329.png)