added release and citation info
added the badge for the zenodo citation page and the release number to the top of the doc
@@ -3,6 +3,8 @@ Heterogeneous Agents Resources and toolKit
August 29, 2017
+Release 0.8.0. Click the badge below for citation information.
+[![DOI](https://zenodo.org/badge/50448254.svg)](https://zenodo.org/badge/latestdoi/50448254)
Christopher D Carroll1
