begining stages of UI for new intro/login interactions for non-authenticated users.

unl_theme/views/default/account/forms/login.php

unl_theme/views/default/images/wdn_notice_ActionBG.png

unl_theme/views/default/images/wdn_notice_BG.png

unl_theme/views/default/images/wdn_notice_EarthIcon.png

unl_theme/views/default/page_elements/header.php

unl_theme/views/default/page_elements/unl_nav.php