code: public Class<?> getRelationshipMetaType(Class<?> clazz, String relationshipName) {
  		return relationshipMetaTypeMap.get(clazz).get(relationshipName);
  	}
docs: Returns a type of a relationship meta field.
  @param clazz {@link Class} owning the field with relationship meta annotation
  @param relationshipName {@link String} name of the field
  @return {@link Class} meta field type