Being notified when a push does not fix a dangling HEAD
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Things can get confusing quickly when you've got a repository
where the symbolic ref HEAD does not point to an existing branch.
This is called a "dangling HEAD".

Since Gitano allows you to change the HEAD symbolic ref from refs/heads/master
it can be easier to accidentally leave it dangling after pushing a branch.

To reduce the surprise involved, Gitano will provide a warning
if after a push the HEAD symbolic ref is dangling.

    SCENARIO Pushes resulting in a dangling HEAD are warned about

    GIVEN a standard instance
     WHEN testinstance adminkey runs create testrepo
      AND testinstance adminkey runs config testrepo set project.head refs/heads/trunk
      AND testinstance, using adminkey, clones testrepo as testrepo
      AND testinstance applies add-a-FOO.patch in testrepo
      AND testinstance, using adminkey, pushes testrepo to testrepo.git
     THEN stderr contains WARNING: HEAD remains dangling

    FINALLY the instance is torn down