Changed key in Stash build to include baseurl

- We have multiple Jenkins installations which build the same project in slightly
  different ways, and as such using the project name as the key in Stash causes
  conflicts (one build server overwrites the other).  This adds the url of the
  server which produced the build to the build status key.
Merge pull request #7 from pzelnip/githubdevelop

Changed key in Stash build to include baseurl. Thanks for the pull request, Adam!