some steps of act-1560
act-1560
update userguide for delete taskListerEvent
sample implementation of ACT-1738
Upgrade to commons-lang3. See http://commons.apache.org/proper/commons-lang/
try to add test case for MDC. Not working yet
complete implementation of ACT-1738
Merge remote-tracking branch 'upstream/master' into act-1738
add files for act-1738
add files for act-1738
add comments
update userguide
enhance MDC documentation
correct typo
repackage LogMDC
Merge branch 'master' of https://github.com/marcusk24/Activiti into CmdTC

Conflicts:
	modules/activiti-spring/src/main/java/org/activiti/spring/components/scope/ProcessScope.java
- add MySQL QA configuration.
- misc minor fixes.
Merge branch 'master' of https://github.com/marcusk24/Activiti into CmdTC
added task query capability to query on empty due dates
Fixed issue with extension elements and attributes multiple occurrences with same id