Use jquery function load() instead of get() when refreshing a feed. Instead of inserting new new entries, the whole list of entries for the feed is inserted, replacing the previous list.

This has several advantages:

- cleaner code.
- ensure that when refreshing always the current list of entries is displayed, even if the user has several tabs/browsers open and is refreshing from different sessions.

The price to pay is probably a performance and bandwidth hit; instead of downloading the HTML for new entries, we download the HTML for the whole list of entries.

This also saves us one line of coffeescript code.