Proposal to add integration jobs as downstream of the push job

As the integration jobs currently rebuild their own server, their is no need
to wait until completion of the build jobs to trigger them.
Merge pull request #735 from sbesson/integration_graph

Proposal to add integration jobs as downstream of the push job
rebase 712
Updating insight contributing file
addressing Mark's comments
Make job plural
Merge pull request #739 from hflynn/rebased/develop/icehome

Unix/Linux installation: Update requirements (rebased onto develop)
Merge pull request #740 from hflynn/rebased/develop/insight-contrib

Updating insight contributing file (rebased onto develop)
merge develop -D none -I breaking -E exclude

Repository: openmicroscopy/ome-documentation
Excluded PRs:
  # PR 741 hflynn 'Remove Ubuntu versions which aren't supported by upstream (rebased onto develop)' (user: hflynn)
Updating 6c60e92..54672e8
Merged PRs (fast-forward):
  # PR 740 hflynn 'Updating insight contributing file (rebased onto develop)'
  # PR 739 hflynn 'Unix/Linux installation: Update requirements (rebased onto develop)'
  # PR 735 sbesson 'Proposal to add integration jobs as downstream of the push job'
  # PR 733 ximenesuk 'Clarify location and group for DropBox imports. (rebased)'
  # PR 734 hflynn 'Improvements to import scenarios (rebased onto develop)'

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