Lightning 1.9.1 release config

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extra : rebase_source : db7370f4ba9ef1db31bb441d30608c6f4e37c4aa
Lightning 1.9.1: add configuration for comm-esr17
Locales for Lightning 1.9.1
Lightning 2.1b1 configuration
Corrected changeset for Lightning 2.1b1 release
bug 730545: decomission talos-r4-lion-058. r=rail
bug 838789: Release builds trigger tests too many times. r=rail
Lightning: mozconfig changes for lightning 2.1b1

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extra : rebase_source : 22f9bb240d15bed06b8fb9f06de0501c9e63c273
bug 839707 - add mozharness reftest-no-accel to win7. r=rail
bug 793022 - fix scheduler checkconfig. r=rail
Merge branch 'master' of github.com:mozilla/build-buildbot-configs