[maven-release-plugin] prepare release 1.27
[maven-release-plugin]  copy for tag 1.27
[maven-release-plugin] prepare for next development iteration
fix path traversal vulnerability in git changelog api, see issue #319

--HG--
branch : issue-319
fix possible crlf injection, see issue #320

--HG--
branch : issue-320
fix another possible crlf injection, see issue #320

--HG--
branch : issue-320
default repository manager should throw RepositoryNotFoundException
added GroupNotFoundException and UserNotFoundException
added unit tests for repository archive
added unit tests for repository hooks
added unit tests for repository listener
improve repository manager test base
use index of char instead of index of string, if possible
util classes should be final with a private constructor
use async cache for scm realm
added authentication tests for ScmRealm
added ScmRealm role based authorization tests
start implementation of permission tests for ScmRealm
implement user and group authorization tests for ScmRealm
added missing deprecated annotations