ACT-1890: expand multi tenancy support to cover suspend/activate of process definitions by key
ACT-1890: Fix for mssql upgrade
ACT-1890: Fix for DB2 upgrade test suite
Removed exclusive gateway hard checks and reduced to warnings
Merge branch 'master' of https://github.com/Activiti/Activiti
ACT-1916: Double-check all REST-resources for explicit authenticate()
Merge remote-tracking branch 'upstream/master'