Internalize internet dependencies from hystrix dashboard

I found that the hystrix dashboard has two runtime dependencies: it loads jquery from Google, and the Hystrix logos from Hystrix's Github wiki.

   * In my case, when giving a presentation to java user group, I don't want to depend on a touchy mobile internet connection to show a working Hystrix dashboard.
   * There are also clients that restrict internet access in specific environments, so this change would have an added value for them as well. 
   * If you would use Hystrix Dashboard to analyze a problem resulting from a (local) internet outage, you would be out of luck as the dashboard wouldn't work.

Therefore I think Hystrix dashboard shouldn't depend on Internet resources. The necessary changes are included in the PR.

Thanks, Alexander.