Add missing integeration test for date type parser.

We don't parse date types in the javascript binary parser. Keep this in mind if
you plan to use the binary javascript parser.

Author: booo

test/integration/client/type-coercion-tests.js

@@ -145,3 +145,18 @@ helper.pg.connect(helper.config, assert.calls(function(err, client) {
     sink.add();
   })
 }))
+
+if(!helper.config.binary) {
+  test("postgres date type", function() {
+    var client = helper.client();
+    client.on('error', function(err) {
+      console.log(err);
+      client.end();
+    });
+    client.query("SELECT '2010-10-31'::date", assert.calls(function(err, result){
+      assert.isNull(err);
+      assert.UTCDate(result.rows[0].date, 2010, 9, 31, 0, 0, 0, 0);
+    }));
+    client.on('drain', client.end.bind(client));
+  });
+}