Fix wrong class assigned to button of type "reset"

The "form-control" class should not be assigned to any button of type "reset".
Fix render of "reset" and "button" in inline form

In inline form, the "reset" and "button" type of Buttons don´t need all the extra markup, just the <button> tag with all the inner add-ons.
With this fix, we can also print group buttons. Example:
class GroupButtonsFieldset extends Fieldset{

	public function __construct($name = null, $options = array()) {
		parent::__construct($name, $options);
		$this->add(array(
			'name' => 'save',
			'type' => 'Button',
			'options' => array(
				'label' => 'Save new',
				'glyphicon' => 'floppy-disk',
				'twb-layout' => 'inline'
			),
			'attributes' => array(
				'type' => 'submit',
				'value' => 'save',
				'class' => 'btn btn-success'
			),
		));
		$this->add(array(
			'name' => 'reset',
			'type' => 'Button',
			'options' => array(
				'label' => 'Reset',
				'glyphicon' => 'refresh',
				'twb-layout' => 'inline'
			),
			'attributes' => array(
				'type' => 'reset',
				'class' => 'btn btn-warning'
			),
		));

		$this->add(array(
			'name' => 'generic-button',
			'type' => 'Button',
			'options' => array(
				'label' => 'Back to list',
				'glyphicon' => 'arrow-left',
				'twb-layout' => 'inline'
			),
			'attributes' => array(
				'type' => 'button',
				'class' => 'btn'
			),
		));
	}
}
Merge pull request #56 from alejandro-fiore/master

Fix wrong class assigned to button of type "reset"