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/fullscreenManager.js

@@ -55,7 +55,7 @@ define(['events', 'dom', 'apphost', 'browser'], function (events, dom, appHost,
         return document.fullscreen ||
             document.mozFullScreen ||
             document.webkitIsFullScreen ||
-            document.msFullscreenElement ||  /* IE/Edge syntax */
+            document.msFullscreenElement || /* IE/Edge syntax */
             document.fullscreenElement || /* Standard syntax */
             document.webkitFullscreenElement || /* Chrome, Safari and Opera syntax */
             document.mozFullScreenElement; /* Firefox syntax */