repository: added docs to New and isValid
repository: added docs to New and isValid

gleez/gandalf,scorphus/gandalf,tsuru/gandalf,marcelometal/gandalf,gleez/gandalf,marcelometal/gandalf,scorphus/gandalf,flaviamissi/gandalf,tsuru/gandalf,flaviamissi/gandalf,marcelometal/gandalf,gleez/gandalf