Exclude json from getglue-java (used by oltu dep).
Exclude json from getglue-java (used by oltu dep).

- Fix gradle duplicate json warning.

hoanganhx86/SeriesGuide,epiphany27/SeriesGuide,UweTrottmann/SeriesGuide,r00t-user/SeriesGuide,UweTrottmann/SeriesGuide,artemnikitin/SeriesGuide,0359xiaodong/SeriesGuide