Edited Cobbler website

Updated website for the project (new one is located at http://cobbler.github.io/ instead of http://www.cobblerd.org/)

README.md

@@ -133,7 +133,7 @@
   * [AppScale](http:/github.com/AppScale/appscale) - Cloud software with Google App Engine compatibility.
   * [Archipel](http://archipelproject.org/) - Manage and supervise virtual machines using Libvirt.
   * [CloudStack](http://cloudstack.apache.org/) - Cloud computing software for creating, managing, and deploying infrastructure cloud services.
-  * [Cobbler](http://www.cobblerd.org/) - Cobbler is a Linux installation server that allows for rapid setup of network installation environments.
+  * [Cobbler](http://cobbler.github.io/) - Cobbler is a Linux installation server that allows for rapid setup of network installation environments.
   * [Cracow Cloud One - Polish Private Cloud](http://cc1.ifj.edu.pl/) - The CC1 system provides a complete solution for Private Cloud Computing.
   * [Eucalyptus](https://www.eucalyptus.com/) - Private cloud software with AWS compatibility.
   * [Flynn](https://flynn.io) - PaaS