integrate btdigg search api

details on frostwire-desktop repo ([PR #376](https://github.com/frostwire/frostwire-desktop/pull/376))
got cha.

I believe in about an hour or so, I'll be merging a patch integrating BTJunkie.eu search, this search reads everything necessary about the torrent search results without having to request the individual torrent pages associated to each search result, should be a good reference patch (both here on common, and desktop and subsequently on android) on how to add a magnet based search engine that provides everything right off the search results page.