Ready, Set, Go! Penalty Removal and Revving #34

This is a pull request containing all my current work on the bug #34 (task #1090 on sf).

Basically:
- Boost effect added to startup boost.
- Penalty time for accelerating before "Go" has been removed.
- Revving implemented, but sound isn't playing.

I have a pretty good idea of what should be done next, but due to my current situation, I won't be able to commit code for a little while. If someone does not pick this up by the time I am able to return, I will continue work.