additional fields, validators and widgets for WTForms

 WTForms-Components provides enhanced versions of some WTForms HTML5
 fields and some additional new fields and validatiors.
 These enhancements include:
 .
  * DateTimeField
  * IntegerField
  * SelectField
  * SelectMultipleField
  * ColorField
  * NumberRangeField
  * PassiveHiddenField
  * Read-only fields
  * DateRange validator
  * Email validator
  * If validator
  * Unique Validator