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