Merge pull request #3 from TheBritKnight/master

Fixed README formatting
Adding test with multiple authors and verifying payment amounts
Merge pull request #2 from bjfish/master

Fixing potential issue with payouts not being equal for multiple commits
Added opt-out capabilities. Now commiters can opt-out by adding **NOPAY** to their commit messages (and yes, that NOPAY was intentional. This commit comes gratis).
Implemented @moxie0 's request re comments and asterisks in opt-out method

fixed README to reflect lack of asterisks in Opt-out