registry: missing function addition

* Adds missing dict-like functions iteritems and get to the new dict
  registry DictModuleAutoDiscoverySubRegistry.

* Updates some docs.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
workflows: holding pen fixes

* Fixes an issue getting widgets in an unsupported way.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
utils: Git & SVN Harvester

* Harvester utils to download and archive SVN & Git repos

Signed-off-by: Jake Cowton <jake.calum.cowton@cern.ch>
utils: addition of call checks for vcs commands

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
travis