Implemented isAfter validator that passes the test.

Author: Branko Vukelic

Diff for: lib/validator.js

@@ -225,6 +225,18 @@ Validator.prototype.isDate = function() {
     return this;
 }
 
+Validator.prototype.isAfter = function(date) {
+    date = date || new Date();
+    var origDate = toDate(this.str);
+    var compDate = toDate(date);
+
+    if (origDate && compDate && origDate < compDate) {
+        return this.error(this.msg || 'Invalid date');
+    }
+    
+    return this;
+}
+
 Validator.prototype.in = function(options) {
     if (options && typeof options.indexOf === 'function') {
         if (!~options.indexOf(this.str)) {
@@ -269,3 +281,4 @@ Validator.prototype.isArray = function() {
     }
     return this;
 }
+