Updated with changes to libheader stylesheets recently pushed to Libsite-Header-Lite repo
Numerous css and template changes to improve UI on both sign and screen.  Fixes #176.  Fixes #177.
Returned refresh rate to 30sec.  Had modified for dev purposes and forgotten to put it back.
Merge pull request #178 from gwu-libraries/t176_177_sign_ui_tweaks

T176 177 sign ui tweaks