Merge branch 'master' of https://github.com/Activiti/Activiti
Oops, forgot something.
assignee and owner can be null at this point
Merge branch 'master' of https://github.com/Activiti/Activiti

Conflicts:
	modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/TaskEntity.java
Merge branch 'master' of https://github.com/Activiti/Activiti

Conflicts:
	modules/activiti-engine/src/main/java/org/activiti/engine/impl/persistence/entity/TaskEntity.java
Merge branch 'master' of https://github.com/marcusk24/Activiti
dupe for job.error

duplicated message for job.error, first one is right, keep it.
Updated documentation for using expressions.

Added remark that users can use expressions in text fields of properties
belonging to CustomServiceTasks.

Also removed reference to older versions of Eclipse for developing
extensions.
Added check for history-level to be able to test comments or not
Fix a tiny typo in code sample in user guide
Fixing typo in userguide code example for extending Designer.
Merge pull request #56 from rce/master

Fixed a tiny typo in user guide
Merge pull request #55 from didxga/master

dupe message key
Fixed erroneous specification of the Designer's integration lib Maven
GAV. Also switched repository to the Nexus group.
Updated version example to reflect versioning in Nexus.
fix ACT-1641: make sure only the path part of the url gets rewritten when generating diagram viewer url
Job executor fix
Prepare for 5.12.1 release
build fixes
build fixes