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

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extra : rebase_source : 343da8a380d7a770ef4404bf03557d1452437890
Bug 883498 - Run spidermonkey rootanalysis and generational jobs on all trees feeding into mozilla-central, r=rail

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extra : rebase_source : 3662e28d99bd125604bb2a174456f353e9123a13