so only 1 dashboard allowed for now ...
see at bottom of this page, in summary of descriptions:
https://powerbi.microsoft.com/en-us/documentation/powerbi-developer-content-pack-authoring/
I really recomend allowing multiple DBs in the future as I find that single dashboards with viz from all sorts of timeframes and dimensions have to be so high level that they dont offer any insight ... the DB is then merely a table of contents for the various reports.
