Lodash tests

Added tests for #869, as well as a test runner that can be expanded to include unit tests for other functions of the app. The tests are powered by a simple html page, which is served at http://localhost:5602 by running `grunt test` and can be reloaded as changes to the tests are made.

Because this includes other changes, see the test details at https://github.com/spenceralger/kibana/commit/de5118d3cce284d31b870b361a836d19024a6ff0 and https://github.com/spenceralger/kibana/commit/4fc0bfdbd07d95f70c4598ec6232a88afddff7ee