Proper check for absolute url's

There are two places were url's are being checked against the string `http://`.  This fixes that so that absolute url's of any sort will be correctly detected.

I tried to add a unit test for this but it seems like that whole file would have to be refactored to give access to that function.  If there is another way I would be happy to add a test for this.

Also, there is a second place where the `http` is being hardcoded but I could not find a way to get it to run, so I left it.  That is here https://github.com/Dash-Industry-Forum/dash.js/blob/development/app/js/dash/DashParser.js#L254

And here is my signed agreement:
![dash-if-feedback-agreement-3-7-2014](https://cloud.githubusercontent.com/assets/1027776/5109506/49aee298-6fd7-11e4-9759-9c83d7cbdc84.jpg)