mlnp-challenge

Sanitizes all SQL inserts; increments `requested` counter in GET /; Finishes...

Fixes error output for invalid URLs and removes all console.debug output

Unit tests for URLShortener#constructor (run with `npm test`); Also...

Begins decoupling server app from business logic (creating URLShortener class in a src module).

Adds mocha and should, with combined sample test; Adds repository field to package.json