tweak jshint

Author: liabru

.jshintrc

@@ -29,12 +29,13 @@
 
     // variables
     "undef": true,
+    // "unused": true,
     "-W079": true,            // Silence redefinition errors (they are false positives).
     "-W020": true,            // Silence readonly error (needed to simplify support for node).
     "predef": [
         "Matter", "window", "document", "Element", "MatterTools",
-        "phantom", "process", "HTMLElement", "require", "PIXI",
-        "$", "Image", "navigator", "setTimeout", "decomp", "module",
+        "phantom", "process", "HTMLElement", "require", "PIXI", "$",
+        "Example", "Image", "navigator", "setTimeout", "decomp", "module",
         "Body", "Composite", "World", "Contact", "Detector", "Grid", 
         "Pairs", "Pair", "Resolver", "SAT", "Constraint", "MouseConstraint", 
         "Common", "Engine", "Mouse", "Sleeping", "Bodies", "Composites",