Demonstration release of the principles underpinning krsd.

Demonstration release of the principles underpinning krsd.
This is based on rs-serve, present on https://github.com/remotestorage/rs-serve
It includes a demonstration from https://github.com/tastejs/todomvc

Changes relative to rs-serve are manyfold, thus leading to this fork:
 * It is made for virtual hosting, rather than local user accounts
 * It uses Kerberos authentication instead of explicit, JS-programmed OAuth
 * It uses a .k5remotestorage configfile on the filesystem for authorisation
 * It provides service for static web content