Added  changes so that grunt cucumber.js can output live 

Added `process.stdout.write` so that grunt cucumberjs can output live on whats happening. This is great when you are debugging a test, you don't need to wait to look at console output until after test execution is complete
Debug flag added so that console.log is configurable
debug option added.
Merge pull request #24 from nikulkarni/master

Added  changes so that grunt cucumber.js can output live