Remove shims for obsolete browsers, fixes #98

Users wishing to support older browsers (like IE 8, for example) will need to
shim `Array.isArray` and `Array.prototype.filter` themselves.

Author: Beau Gunderson

lib/director/browser.js

@@ -6,24 +6,6 @@
  *
  */
 
-if (!Array.prototype.filter) {
-  Array.prototype.filter = function(filter, that) {
-    var other = [], v;
-    for (var i = 0, n = this.length; i < n; i++) {
-      if (i in this && filter.call(that, v = this[i], i, this)) {
-        other.push(v);
-      }
-    }
-    return other;
-  };
-}
-
-if (!Array.isArray){
-  Array.isArray = function(obj) {
-    return Object.prototype.toString.call(obj) === '[object Array]';
-  };
-}
-
 var dloc = document.location;
 
 function dlocHashEmpty() {