[#266] - Make reactor processes auto-restart on unhandled exceptions
[#266] - Make reactor processes auto-restart on unhandled exceptions

This commit includes
 - The RestartableProcess multiprocessing.Process proxy which has .check() and .reinit() to allow processes to be restarted
 - Updates so that the reactor process uses RestartableProcess and monitors its child processes

heiths/allura,heiths/allura,heiths/allura,lym/allura-git,Bitergia/allura,apache/incubator-allura,lym/allura-git,lym/allura-git,lym/allura-git,apache/allura,apache/allura,leotrubach/sourceforge-allura,Bitergia/allura,lym/allura-git,Bitergia/allura,apache/incubator-allura,Bitergia/allura,Bitergia/allura,leotrubach/sourceforge-allura,leotrubach/sourceforge-allura,apache/allura,apache/incubator-allura,leotrubach/sourceforge-allura,heiths/allura,apache/allura,heiths/allura,apache/allura,apache/incubator-allura