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.

forgot to mention... also created reachlocal/liger-common connection in travis-ci to run the tests in travis. When we do this merge, it will do the first test run.