Fixed a variable typo in \Phalcon\Forms\Element::addValidator().
\Phalcon\Tag::_inputField() no longer wraps its `$attribute` in an array when it already is one.
Added a missing line to \Phalcon\Forms\Element::__construct().
Fixed a variable typo in \Phalcon\Forms\Form::getMessages().
Merge pull request #17 from SidRoberts/forms

\Phalcon\Forms and \Phalcon\Validation
Added is_scalar checks for \Phalcon\Validation\Message\Group #14