Fixed Mockup crashes after GameMetadata changes.
Merge pull request #161 from RotaruDan/GameMetadataChangesMockupCrash

Fixed Mockup crashes after GameMetadata changes.
Parity2 game moved to a new repo (https://github.com/e-ucm/parity2.0)
Adding maven oss-nexus distribution information, hence our maven artifacts are publicly accessible. Fixes #162