Default credentials Warning

This includes the following changes:

1) The default user/pass was changed to admin/changeme
2) A warning message to change the credentials from the default was added to Kilt layout.

![my kilt app-7](https://cloud.githubusercontent.com/assets/148768/3945082/ed49ae24-262b-11e4-81ac-ea47b9c75271.png)

Sometime soon, I'll get this controller under tests.