removed the extensions to Date, put them in their own library

test/date_format.js

@@ -0,0 +1,23 @@
+var vows = require('vows')
+, assert = require('assert')
+, dateFormat = require('../lib/date_format');
+
+vows.describe('date_format').addBatch({
+    'Date extensions': {
+        topic: function() {
+            return new Date(2010, 0, 11, 14, 31, 30, 5);
+        },
+        'should format a date as string using a pattern': function(date) {
+            assert.equal(
+                dateFormat.asString(dateFormat.DATETIME_FORMAT, date),
+                "11 01 2010 14:31:30.005"
+            );
+        },
+        'should default to the ISO8601 format': function(date) {
+            assert.equal(
+                dateFormat.asString(date),
+                '2010-01-11 14:31:30.005'
+            );
+        }
+    }
+}).export(module);