Running Tests in Shippable

We were having trouble with getting Travis CI to run grunt-cli. We made a series of edits to travis.yml and package.json and then realized we needed to add express:dev to our grunt test tasks in the Gruntfile.js. We also tried running our build test with Shippable and it executed a lot faster. I added the Shippable badge to the README.md and added an updated app summary.