Moved to Beta4 version

Move to Beta3 release version

Release 5.21.0

Move to version 5.20.0

Releasing 5.19.0.2

Move to 6.0.0.Beta2 release

Move to version 5.19.0.1

Merge pull request Activiti#721 from dbmalkovsky/docChanges

Minor spelling changes to User Guide

Release notes + migration docs changed for Activiti 6 Beta 1 release

Activiti 5.18.0 release