Fixed README heroku instructions so that step 4 isn't getting cut off

Fixed markdown syntax in my changes

Removed single quotes around heroku instructions
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 contributers will be able to opt out of recieving a reward,
such as when submitting minor typo fixes.

Implemented @moxie0 's request re comments and asterisks in opt-out method

fixed README to reflect lack of asterisks in Opt-out

Addressed @moxie0's request re freebie and parens
Merge pull request #6 from TheBritKnight/master

Added opt-out capabilities.