add indexof polyfill

Author: rahulcs

unbxdSearch.js

@@ -2,6 +2,72 @@
 var unbxdSearchInit = function(jQuery, Handlebars){    
   window.Unbxd = window.Unbxd || {};
 
+  // Production steps of ECMA-262, Edition 5, 15.4.4.14
+  // Reference: http://es5.github.io/#x15.4.4.14
+  if (!Array.prototype.indexOf) {
+    Array.prototype.indexOf = function(searchElement, fromIndex) {
+
+      var k;
+
+      // 1. Let O be the result of calling ToObject passing
+      //    the this value as the argument.
+      if (this == null) {
+	throw new TypeError('"this" is null or not defined');
+      }
+
+      var O = Object(this);
+
+      // 2. Let lenValue be the result of calling the Get
+      //    internal method of O with the argument "length".
+      // 3. Let len be ToUint32(lenValue).
+      var len = O.length >>> 0;
+
+      // 4. If len is 0, return -1.
+      if (len === 0) {
+	return -1;
+      }
+
+      // 5. If argument fromIndex was passed let n be
+      //    ToInteger(fromIndex); else let n be 0.
+      var n = +fromIndex || 0;
+
+      if (Math.abs(n) === Infinity) {
+	n = 0;
+      }
+
+      // 6. If n >= len, return -1.
+      if (n >= len) {
+	return -1;
+      }
+
+      // 7. If n >= 0, then Let k be n.
+      // 8. Else, n<0, Let k be len - abs(n).
+      //    If k is less than 0, then let k be 0.
+      k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
+
+      // 9. Repeat, while k < len
+      while (k < len) {
+	// a. Let Pk be ToString(k).
+	//   This is implicit for LHS operands of the in operator
+	// b. Let kPresent be the result of calling the
+	//    HasProperty internal method of O with argument Pk.
+	//   This step can be combined with c
+	// c. If kPresent is true, then
+	//    i.  Let elementK be the result of calling the Get
+	//        internal method of O with the argument ToString(k).
+	//   ii.  Let same be the result of applying the
+	//        Strict Equality Comparison Algorithm to
+	//        searchElement and elementK.
+	//  iii.  If same is true, return k.
+	if (k in O && O[k] === searchElement) {
+	  return k;
+	}
+	k++;
+      }
+      return -1;
+    };
+  }
+  
   /**
    * Shim for "fixing" IE's lack of support (IE < 9) for applying slice
    * on host objects like NamedNodeMap, NodeList, and HTMLCollection