Demo v0.1.5 released

A new demo version is out now for Windows.  Mac should hopefully follow soon.  New demo for Mac now available too.

New features:

• Championship Standings screen added between races
• New Leader Lamifier: Leader Trikes -- removes the lug nuts from one of the front wheels of the lead car (this should be a bit less harsh than the other lamifier: Finish-line Showboating Required)

Also includes tweaks to the Bubba Prizes and other minor changes.