Do not deoend on dev as it does not exist in some phases.

especially caused by needing some space on jenkins - and deleting dev it frees up some

ref: #143

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,7 +2,6 @@
 
 Great that you are thinking about submitting a PullRequest!
 
-
 Please keep them small if not otherwise possible. Contact me *before* you are creating a big PR to avoid unnecessary work and rebasing of big PRs. Also try to add tests - I am not dogmatic about that but prefer PRs backed by tests. This project has everything setup for Espresso UI and Unit-tests. Also the existing unit and UI-tests muss pass before submitting a PullRequest.
 
-Please base the PullRequests on the branch named dev
+Please base the PullRequests on the branch named dev if one currently exists - otherwise use master