FB Validation, Account Controller cleanup, other minor changes

- Account controller clean up (implemented Facebook login without the
use of the template)
- Market Posts : Modal dialog changes
- HTML fixes (i.e. each element is now postID specific) for Buy/Sell
posts
- LoginRequest dialog was put in place ("sell now", "buy now" now make
sure the user is logged in before making any further changes)
- changed TempData to Session (production bug fix)
- Web.Config connection string change (production bug fix)
- Made the facebook button a link that Alan can style
- Made one of the class attributes in AccountHandler static
- Added a load.gif that needs to be used for each ajax call