v0.3.0

• Add vue_tag and vue_content_tag helper methods
  that can handle :bind, :on, :checked, :disabled, :multiple,
  :readonly, :selected, :text, :html, :show, :if, :else,
  :else_if, :for, :model, :pre, :cloak, :once options.
• Add similar functionalities to the form building helpers.
• Remove :v option handling.