More goodness!

Play testing has proven to be very helpful! This is a minor update, but these small changes really help the game.

The original character advancement rules were flawed and resulted in some odd situations when adding a new skill and taking a skill from 0-1 or 0-2. The new rules avoid that and are actually simpler to understand. All good!

The starting attribute numbers were too low, resulting in characters feeling less heroic than they should when starting out. The numbers were bumped up by 1 which isn't a lot, but each bump adds 5% to the success probability, which ended up being enough.