Changes

* trains - security fixes - karl/jrgm* simplePush - load 1Million - edwong* b2g persona tests/native - peter* sync - kv store db and API - james* sync - client API tests - jrgm* community engagement - karl* persona - cassandra - jrgm* Campaign Manager - test pass on staging setup - edwong/catalin* heka - karl* moz idp support- karl* KPI/metrics - karl* wordPress plugin - peter/catalin* webRTC - persona - https://bugzilla.mozilla.org/show_bug.cgi?id=878941 - peter