Fix contributing link.
Merge pull request #516 from carsonmcdonald/fixcontributelink

Fix broken contributing link
Refute claim that stepdef classes get instantiated for every step. It happens for every scenario.
Add some tags to the helloworld example - and remove the pretty formatter (currently broken). Will add pretty back when it's fixed.
Don't specify tags in runner
Upgrade to cucumber-html 0.2.3
JUnitFormatter does not throw exception in done() method.
Merge pull request #533 from deadmoto/master

Fixed issue #532: JUnitFormatter does not throw exception in done() method.
Closes #532, #533