Issue #1995996 by nod_: Update JSHint configuration.

.jshintignore

@@ -7,10 +7,12 @@ core/misc/jquery.ba-bbq.js
 core/misc/jquery.form.js
 core/misc/jquery.js
 core/misc/jquery.once.js
+core/misc/jquery.ui.touch-punch.js
 core/misc/modernizr
 core/misc/normalize
 core/misc/ui
 core/misc/underscore
+core/misc/domready
 core/misc/vie
 core/modules/tour/js/jquery.joyride-2.0.3.js
 core/vendor

.jshintrc

@@ -2,13 +2,14 @@
   "browser"   : true,
   "curly"     : true,
   "eqeqeq"    : true,
-  "expr"      : true,
   "forin"     : true,
   "latedef"   : true,
   "newcap"    : true,
   "noarg"     : true,
+  "strict"    : true,
   "trailing"  : true,
   "undef"     : true,
+  "unused"    : "vars",
   "predef"    : [
     "Drupal",
     "drupalSettings",