Added CI and coverage reporting

- Added travis and coveralls png links to readme.md
- opened coveralls account
- updated test: script in package.json to include call to coveralls
- added coveralls as an npm dependency
- changed readme to use `grunt` for users to test, as `npm test` is now reserved for
  travis-ci which should have connectivity to call coveralls
- DENOTED cordova.js AS VENDOR CODE TO REMOVE IT FROM OUR COVERAGE STATS.
Removing coveralls, for now.

- removed call to coveralls in the test script
- removed coveralls status png from readme
- changed readme instructions to use `npm test` again

To make coveralls work, we need to add Secure Environment Variables
to our travis setup to hold our secret key for coveralls. That work can be
done separately to get this PR merged, now.

environment variables
Merge pull request #3 from bikeonastick/add_travis_png_to_readme

Added CI and coverage reporting