Constraint::Regex has new anchored() accessor
New Element::Email HTML5 email field
Form and Elements have new title(), title_xml() and title_loc() attribute accessors
New Element::URL HTML5 url field
New Input attribute accessors

- new accessors: placeholder(), pattern(), autocomplete()
- new boolean attribute accessors: autofocus(), multiple(), required()
switch Element::URL to use new pattern() accessor
Support for HTML5 datalists for Input elements
minor Cookbook tweaks