Updated welcome page timer and prog bar

Changed progress bar to always use a jQuery animation. This allows us to
make this timer configurable by only having to set the animation
duration through javascript.

Added page template variables to for welcome_page_enabled and
welcome_page_timer Drupal settings.

Updated welcome ad trigger logic to fire before content load and to
populate configuration settings values from Drupal via the page
template.
Minified page-welcome.css
Fix page scripts after update from Greg