Added RT and IMDB links. Misc other fixes/changes

Added links/logos for IMDB and Rotten Tomatoes to movie listing and
details pages. DatabaseSecurityInitializer now sets the IMDB link. Admin
"edit movie" page will also set IMDB link. Added about page with some
temporary text. Added stats for total movies and total ratings. Small
update to user details page. Deleted old DB folder.