Update the loading snackbar

Currently we have three snackbars that inform the user of the feeds loading:

• loading
• success
• failure

When you are on a fast connection the "loading" snackbar pops up only for a split second before being replaced by the "success" snackbar. The user gets a jolt/blip, that makes it feel like something is wrong with the application.

I think that we should delay the loading of the "loading" snackbar for 3 seconds. If the feed is still loading, show the loading snackbar with a message that says, "still loading ...". This will inform the user that something is in fact happening behind the scenes, but also on fast connections this snackbar will be skipped when the feed completes its load within 3 seconds.