Tweak JSHint and JSCS checks.

Be more consistent across the whole codebase.

Also, make use of JSHint's 2.5.1 `extends` and `qunit` options. This way we set our basis options in js/.jshintrc and override the rest.

js/.jshintrc

@@ -1,13 +1,15 @@
 {
   "asi"      : true,
-  "boss"     : true,
   "browser"  : true,
-  "debug"    : true,
-  "devel"    : true,
   "eqeqeq"   : false,
   "eqnull"   : true,
+  "es3"      : true,
   "expr"     : true,
+  "jquery"   : true,
+  "latedef"  : true,
   "laxbreak" : true,
-  "unused"   : true,
-  "validthis": true
+  "nonbsp"   : true,
+  "strict"   : true,
+  "undef"    : true,
+  "unused"   : true
 }