Add jQuery mobile base.html template

Reference:
 - http://learn.jquery.com/jquery-mobile/getting-started/
 - https://docs.djangoproject.com/en/1.6/topics/templates/#template-inheritance
Update jQuery version

Reference:
 - http://jquerymobile.com/download/
Add buttons on the main page

Reference:
 - http://demos.jquerymobile.com/1.4.2/icons/