Updated Kwixer plugin

- Fixed uppercase queries
- Added release year in detail view
- Possibility to query directors as well, ex: movies by Ron Howard
@rodrigue-h Please make the indentation uniform here. It might also be better to put the trigger words in a file because there are a lot of them. (See https://github.com/duckduckgo/zeroclickinfo-spice/blob/master/lib/DDG/Spice/GooglePlus.pm#L18)