Fix global declaration of paths variable

Author: dashersw

observable-slim.js

@@ -12,7 +12,7 @@
  *	understood as possible. Minifies down to roughly 3000 characters.
  */
 var ObservableSlim = (function() {
-	paths = [];
+	var paths = [];
 	// An array that stores all of the observables created through the public create() method below.
 	var observables = [];
 	// An array of all the objects that we have assigned Proxies to