* OmdbProvider: The result often contains strings like '2010-' or
'2010-2012'. I fixed the parsing to use the first 4 digits only in these
cases
* TheMovieDb: While the search method did send appropriate queries for
different search types, it didn't differentiate for deserialization of
results. I fixed this at least for the TvResults, in order to get the
'first_air_date' property parsed.
* TheTvdb: The parsing of the 'FirstAired' node was missing here as
well (for search results)