code: function listInstanceMethods (Model) {
    var classMethods = Object.keys(Model.schema.methods);
    for (var method in ModelPrototype) {
      if (!isPrivateMethod(method) && isFunction(ModelPrototype[method])) {
        classMethods.push(method);
      }
    }
    return classMethods;
  }
docs: Return list of all instance methods when supplied a Model constructor
  @param {Object} Model
  @return {Array}