Merge pull request #178 from owncloud/JustOneCSRFTokenPerSession

core/ajax/requesttoken.php

core/js/eventsource.js

core/js/requesttoken.js

core/routes.php

core/templates/layout.base.php

core/templates/layout.guest.php

core/templates/layout.user.php

lib/base.php

lib/template.php

lib/util.php