Activating/Suspending processDef throws Exception

Activating/Suspending processDef with process instances throws Exception if a process instance is already in the same state.
Merge pull request #46 from balsarori/master

Fix #45 - Activating/Suspending processDef throws Exception
Merged with Dimitry's repo
Merge branch 'master' of https://github.com/Activiti/Activiti
Moved to version 5.12
i18n zh-CN for explorer 5.12
release notes 5.12
Merge pull request #48 from henryyan/master

i18n zh-CN for explorer 5.12
ACT-1593: support for multiple charts in same report
ACT-1593: added support for disabling report data generation
ACT-1593: try to fix running on tomcat (not yet working) + tweak to help desk report
Merge branch 'master' of github.com:Activiti/Activiti
Pull back native query paging due to mssql and db2 errors on qa
Merge branch 'master' of https://github.com/Activiti/Activiti
Explorer Tomcat fix
Post 5.12 fix
Updated outdated screenshots
ACT-1593: final bits and pieces before the big release. Docs + final tweaks.
Merge branch 'master' of github.com:Activiti/Activiti
ACT-1593: specially for Tijs.