Smoother UI polling updates in website

[mmooney]

Right now for pages that do polling (deploy request status, etc), the JS code pulls a new copy of the data from the API every 10 seconds and rebinds the scope. This fires the Please Wait popup and can be jarring, and slow when there is a lot of data. Instead, we want to have something that pulls down the recent deltas and merges them into the client data, so that the part of the screen affected by the new data is updated, but there is no jarring refresh.