Bug fix for push snippet

This should fix https://github.com/balopat/codingboard/issues/14. The problem was that we were doing a request to a url with the board name non on url form (lowercase and with _ for spaces).

One thing I am not very happy about it is that I haven't covered this with a test. But I wasn't sure how to test this. Any ideas guys?

Do we really want to refresh every 2 seconds? Apparently is not a problem calling the api that often, but we should keep an eye on it in case this starts getting a problem because we pull too often.

Cheers,
Carlos