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/defaults.js

@@ -1,6 +1,6 @@
 import {nullParser} from './cli/utils/parsers';
 
-let logsFolder = (() => {
+let logsFolder = (() => {
   let folder = './logs/';
   if (typeof process !== 'undefined' && process.env.NODE_ENV === 'test') {
     folder = './test_logs/'
@@ -11,7 +11,7 @@ let logsFolder = (() => {
   return folder;
 })();
 
-let { verbose, level } = (() => {
+let { verbose, level } = (() => {
   let verbose = process.env.VERBOSE ? true : false;
   return { verbose, level: verbose ? 'verbose' : undefined }
 })();