Add: Support for AliasNames

TvDB's GetSeries function can return AliasNames. Example: http://thetvdb.com/api/GetSeries.php?seriesname=Raumschiff%20Enterprise%20-%20Das%20n%C3%A4chste%20Jahrhundert&language=de
Update Serie.php
Merge pull request #10 from johannesx75/patch-1

Add: Support for AliasNames