Bug 883498 - Add a new BRANCH_PROJECTS section for project jobs associated with Gecko branches, r=rail

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extra : rebase_source : aa89fbe065f59a9b794ff39a5d1c8eee62ed78e8
Bug 883498 - Run spidermonkey rootanalysis and generational jobs on all trees feeding into mozilla-central, r=rail

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extra : rebase_source : c4c637640ffdec5fc5334ea07b9a9591382c8880