Activity page

Hi,
I added a feature that allows you to link directly to a service's activity from the /activities page by storing the key for the service. This has been useful for me to quickly delete a  bad activity, or just to view it.

You might even be able to start dedupe already synced activities based on the ServiceKey.

Let me know what you think.

-Blake
Should be fine since an empty href seems to be okay: http://jsfiddle.net/pdU5T/2/
http://stackoverflow.com/questions/5637969/is-an-empty-href-valid