Add some linting rules for the CI (#587)

* enable one-var rule

* enable indent rule

* enable no-multiple-empty-lines rule

* enable no-empty rule

* enable no-trailing-spaces rule

* enable no-extra-semi rule

* add eslint rules to fix block spacing

* enable max-statements-per-line rule

* enable brace-style rule

* fix some spacing issues and add future rules

* add code suggestions

src/components/youtubeplayer/plugin.js

@@ -135,7 +135,6 @@ define(['require', 'events', 'browser', 'appRouter', 'loading'], function (requi
 
             require(['queryString'], function (queryString) {
 
-
                 instance._currentSrc = options.url;
                 var params = queryString.parse(options.url.split('?')[1]);
                 // 3. This function creates an <iframe> (and YouTube player)