Changing Credits to a UITableView with current (4.0) and past (3.0 and lower) tableviewcells.

Added current and past credit html files.

Changed AboutCreditsVC to a UITableViewController.
Created OlderCreditsTableViewCell to toggle older credits.
Get rid of animating bottom cell on first load
Removed/Added whitespace
Changed background color to white.

Removed tableview separator.

Added name to credits
Removed set width.  We are not displaying this full width on the iPad
Added #pragma mark
Renamed variable for clarity. (dict -> webViewHeightsDictionary)
Changed way webViewHeightsDictionary is initialized.
Set number of rows to be 2.
Merge pull request #412 from MIT-Mobile/3.6/barless-dashboard-credits

Updating credits on about page. Fixed #387