Implement Gemeente Ede as a source

Implement [Gemeente Ede](https://github.com/openstate/open-cultuur-data/wiki/Gemeente-Ede) as a source

* The CSV file was converted to JSON, then uploaded to the static opencultuurdata endpoint
* We now have a station JSON importer as well (It's different from the dump importer)
* There's a slight issue with get_all_text() which I wasn't sure how to solve. I've added the call in the item transformer to make sure the tests pass
See [this](https://www.python.org/dev/peps/pep-0008/#maximum-line-length) :P (Sorry, I have a really nasty Atom plugin which barfs all kinkds of messages when it does not conform to pep8. More importantly, it automatically skips to the first pep8 error it can find >:P )