Merge branch 'master' into 'stable-3.1'

Marius Burkard

2016-04-29 d30f2c69b1fbfcb9bebe17996d11dc4863afd8bc

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check process hhvm_{SYSTEM_USER} with pidfile /var/run/hhvm/hhvm_{SYSTEM_USER}.pid
   start program = "/etc/init.d/hhvm_{SYSTEM_USER} restart"
   stop  program = "/etc/init.d/hhvm_{SYSTEM_USER} stop"