Add feature: icon-text pull-right

[goodseller]

Add a feature that the icon-text is placed on the right of the text in a button.

Example code:

      <footer class="toolbar toolbar-footer">
        <div class="toolbar-actions">
          <button class="btn btn-default">
            <span class="icon icon-text icon-cancel"></span> Cancel
          </button>

          <button class="btn btn-primary pull-right">
            Send <span class="icon icon-text icon-mail pull-right"></span>
          </button>
        </div>
      </footer>

Demo: