Adds the _AuctionTile.cshtml partial helper file.

This allows us to remove the table header and replace it with calls to the
_AuctionTile partial helper file.
Changes Title for Auctions/Index.cshtml and adds Featured section to
Auctions/Index
Adds the LayoutWithSidebar partial helper.

Includes the layout in Auctions/Index.
Merge remote-tracking branch 'origin/master'