config parameters for relationshipType, dataType, MeasurementUnit  defaults
Merge branch 'develop' of github.com:MetadataRegistry/ModelCataloguePlugin into develop

Conflicts:
	ModelCatalogueCorePlugin/grails-app/conf/Config.groovy
	ModelCatalogueCorePlugin/grails-app/domain/org/modelcatalogue/core/DataType.groovy
	ModelCatalogueCorePlugin/test/integration/org/modelcatalogue/core/DataElementISpec.groovy
	ModelCatalogueCorePlugin/test/integration/org/modelcatalogue/core/RelationshipISpec.groovy
	ModelCatalogueCorePlugin/test/integration/org/modelcatalogue/core/RelationshipTypeISpec.groovy
Merge branch 'develop' of github.com:MetadataRegistry/ModelCataloguePlugin into develop
Merge branch 'develop' of github.com:MetadataRegistry/ModelCataloguePlugin into develop
close #21 , close #70