Update about the drone build and amazon s3 war artifact download. Also, ...

...the default repose-ui properties/config are provided and they can be overridden by specifying a sytem property repose-ui.config.location that points to a file that has properties to be overriden
It may suffice to say:
"[Download the WAR file](https://s3.amazonaws.com/repose-ui-bucket/artifacts/repose-ui-0.1.2.war)"