Automated configuration bump: update configs for Thunderbird 28.0b1 build 1
Added tag THUNDERBIRD_28_0b1_RELEASE_RUNTIME, THUNDERBIRD_28_0b1_BUILD1_RUNTIME for changeset 4b1a0497cb0e
Bug 966070 - Add buildbot-master{75..79}; disable buildbot-master{58,61,63..65}. r=rail

--HG--
extra : amend_source : ed882e528c9946cefa4235ca4cc3c7c8ea6202f6