integrate btdigg search api

details on frostwire-desktop repo ([PR #376](https://github.com/frostwire/frostwire-desktop/pull/376))
is 'private-a6c30ec834a040bb' some sort of api token?
how do we know this URL will stay there?

is there a link you can share where they have published this API or you just reversed engineered it?

I'm just concerned search will stop working simply if they invalidate what looks like an API Token.