ACT-1593: adding process instance overview chart
Merge branch 'master' of github.com:Activiti/Activiti

Conflicts:
	modules/activiti-explorer/src/main/java/org/activiti/explorer/Messages.java
Merge branch 'master' of github.com:Activiti/Activiti

Conflicts:
	modules/activiti-explorer/src/main/java/org/activiti/explorer/Messages.java
ACT-1593: adding process instance overview chart (fixes)