Bug 991476 - Decommission the ionmonkey tree. r=catlee

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extra : rebase_source : a620c8f8e4b2824d806bb5a16ea1a589468b4bef
bug 978319 - mozharness desktop builds linux cedar -- fix debug unittest sendchange, r=aki
bug 991393 - add flame to b2g-inbound b2g_bumper. r=catlee
Bug 920485 - Using tooltool cache. r=rail
Merge bugs 991476, 978318, 991393, and 920485 to production.

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branch : production