Add GET /feeds/refresh for fetching feeds

[chrishunt]

A start to #33

This adds:

• /feeds/refresh for fetching all feeds
• /feeds/:feed_id/refresh for fetching a feed given an id

Thoughts?

I'm happy to change the verb to POST if you feel strongly about it, but GET made sense to me.

[rricard]

This is a good idea. I'm tired of waiting one hour to see my feeds refreshed.

[swanson]

This could potential take a while if you have a lot of feeds (and will cause timeouts on Heroku) - might be best to throw them into the DelayedJob queue with FetchFeeds#enqueue.

My intention with #33 was to allow me to leave the tab open and have it refresh (on the hour) when new stories came in - I'm not quite convinced that manual triggering has much value.

[chrishunt]

@swanson Ah, I see. I got the impression in #33 you wanted a webhook to hit with JS in the background to refresh. Feel free to close the issue.

It sounds like what we really want is a way to ask 'have any new stories been fetched?' and, if so, update the content.

[swanson]

Ya #33 was not super clear - I misunderstood what Fever meant by auto refreshing.

I think something like:

wait 5 minutes
poll if any new unread stories have been added
if so, render the new stuff

It gets a bit tricky because you don't want to do weird stuff with rendering if the user is just reading a long article. Maybe something like how Twitter does the new messages when you have the page open would be better.