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

--HG--
extra : rebase_source : 333175c67e41b1ee14520ae983e1d00746c253bd
Bug 883498 - Run spidermonkey rootanalysis and generational jobs on all trees feeding into mozilla-central, r=rail

--HG--
extra : rebase_source : ff615315f5719764d0e1ce31d2705ad92643d074