Adds liniting into the workflow (#3082)

* initial linting of src

* fix indent to 2 spaces

* Removes unnecessary rules

* ignore spec folder for now

* Spec linting

* Fix spec indent

* nits

* nits

* no no-empty rule

src/password.js

@@ -4,7 +4,7 @@ var bcrypt = require('bcryptjs');
 
 try {
   bcrypt = require('bcrypt');
-} catch(e) {}
+} catch(e) { /* */ }
 
 // Returns a promise for a hashed password string.
 function hash(password) {