Merged changes from live site (minus config files).

Changes:
- Switched from Facebook feed to Twitter feed on home page (still broken)
- [add] atom and under construction images
- [add] robots.txt
- [add] new .htaccess file
- [fix] delete duplicate BAgarwal.png
Added production environment config files and sample database config.

Also removed keys.php.sample in favor of having a database.sample.php sample config file instead.