Add user.getInfo implementation and example tests.
Add prepareQuery in UserClient.
Add user.getLovedTracks implementation and example tests.
Add user.getNeighbours implementation and example tests.
Add user.getRecentTracks implementation and example tests.
Add user.getTopAlbums implementation and example tests.
Add user.getTopArtists implementation and example tests.
Add user.getTopTracks implementation and example tests.
Add user.getTopTags implementation and example tests.
Add comments in User section.
Add comments in client.go.
Add comments in lastfm_responses.go