Put OFirehose example in documentation to show how to subclass Feed class

[moggers87]

We already have everything needed to read off OFirehose, but it would be nice to provide users with a something that they can just call and get Note objects etc. out of it.

[kabniel]

I cant see the full conversation about this on pump.io, but i assume we're just talking about loading the https://ofirehose.com/feed.json file into a Feed object?

I added a p firehose (why are you giggling?) command with code that could easily be added to PyPump instead

[moggers87]

That's a lot simpler than I was imagining - maybe we could add something similar to the documentation? (ha!)

[kabniel]

It's not a perfect solution as the ofirehose feed is more limited than the usual pump.io feeds and the class will have to be re-instantiated every time you want to get items from it, it could probably be improved by overriding a few more methods. For the p firehose command it's good enough though as we only use it once for every time the command is run.