Allow a custom message to be provided for validation failures

[sglanzer-deprecated]

E.g. instead of

propTypes: {
    _name: PropTypes.string.isRequired
}

Logging the message "Missing required property _name"

I'd like the ability to do something like

propTypes: {
    _name: PropTypes.string.isRequired(`comp-foo requires a name: {{comp-foo '<name>'}}`
}

Logging the message "comp-foo requires a name: {{comp-foo '<name>'}}"