Update README.md
small formatting change and update to assignment instructions
Fixes #3 updated so variables are passed in constructor and tick() instead of Park instance
Merge pull request #6 from PsychicNoodles/master

Fixes #3 updated so variables are passed in constructor and tick() instead of Park instance
update readme.md to include upstream instructions.
Merge branch 'master' of git://github.com/cforster/theme-park-project

Conflicts:
	README.md