function directiveNormalize(name) {
  return camelCase(name.replace(PREFIX_REGEXP, ''));
}
Converts all accepted directives format into proper directive name.
All of these will become 'myDirective':
  my:Directive
  my-directive
  x-my-directive
  data-my:directive

Also there is special case for Moz prefix starting with upper case letter.
@param name Name to normalize