remove node_modules folder from repo
ignore node_modules with .gitignore
update package.json
Merge pull request #7 from samccone/sjs/fix-example-app

Sjs/fix example app
use the latest version of express
default to the latest versions of node and npm on heroku
bump the version
add a README
add devcenter links to readme
fix markdown typo
use latest versions of node and npm on heroku