Fixed #15 HandlebarRenderer calls a super constructor
Merge branch '15_Handlebar'
Rendering a fieldset is optional closed #16
Merge branch '16_Fieldset'
Added a beforeRendering callback closes #17
Merge branch '17_BeforeRendering'
Input and Textarea support a placeholder closes #18
Merge branch '18_Placeholder'
Component.createDom builds also its children closes #19
Merge branch '19_Children'
Added a Component.destroy method for destroying the component closes #20
Merge branch '20_Destroy'
Added Dom.getLastSibling #21
Added Dom.getFirstSibling closes #21
Merge branch '21_LastSib'
wzk.ui.form.Select selects first option by default closes #23
Merge branch '23_Select'