Minor fixes
Merge branch 'sever_devel' of github.com:openphacts/OPS_LinkedDataApi into sever_devel
Merge branch 'develop' of github.com:openphacts/OPS_LinkedDataApi into sever_devel
Draft files for Associations by Disease and Disease Info
Implemented Associations by Disease calls
Removed extra info from Disease by Target
Removed extra info from Disease Get Targets calls
Refined Associations by Target calls
Added Disease Info call
Fixed and added documentation