Support for master auth

[justinclayton]

This would be required if anyone were to want to use Mesos-UI on a DC/OS Mesos cluster. While the DC/OS UI has some overlap with this project, there are a handful of things that Mesos-UI does quite a bit better.

Feature would probably include adding support to call the master with a principal, and some quick docs on how to create a principal and set the ACLs appropriately on your master.

http://mesos.apache.org/documentation/latest/authorization/

[enxebre]

@justinclayton sounds cool. We'd love contributions from the community on this and any additional feature as we currently don't have as much time as we'd like to work on this.
If you are using mesos-ui on your company would you mind to add the name on the readme list?
Thanks!