#453: Add Summary reporter

Added summary.js to the reporters directory
Updated package.json to add the CLI-table dependency 
I am use to working on projects with multiple people where additional tests may be added/edited at any time. It is then up to the writer of the tests to ensure that the tests are future proof, otherwise you're editing n*2 files for every n change.

If another file was added to the test/data/reporters/summary folder to address another testing concern, this test would still pass (assuming no other broken rules were added)

Are you sure you want me to hardcode that value?