Update examples to include Jest (#183)

* Update examples to include Jest

Also included link to my project where I am successfully implementing jest coverage and travis-ci

* jest example command use pipe to coveralls

README.md

@@ -33,6 +33,13 @@ There are optional environment variables for other build systems as well:
 * COVERALLS_RUN_AT  (a date string for the time that the job ran.  RFC 3339 dates work.  This defaults to your
 build system's date/time if you don't set it.)
 * COVERALLS_PARALLEL (more info here: https://coveralls.zendesk.com/hc/en-us/articles/203484329)
+### [Jest](https://facebook.github.io/jest/)
+- Install [jest](https://facebook.github.io/jest/docs/en/getting-started.html)
+- Use the following to run tests and push files to coveralls: 
+```sh
+jest --coverage --coverageReporters=text-lcov | coveralls
+```
+Check out an example [here](https://github.com/Ethan-Arrowood/harperdb-connect/blob/master/.travis.yml) which makes use of Travis-CI build stages
 
 ### [Mocha](http://mochajs.org/) + [Blanket.js](https://github.com/alex-seville/blanket)
 - Install [blanket.js](http://blanketjs.org/)