Improve changelog generation: trust more jira than commit messages in issue categorization
Fix one warning when using update-ci-repo --skip-update-ci-repo-source;
Fix update-ci-repo task for Pake >= 1.7.2
Make update-ci-repo task a bit more intelligent: check if there already in the ci repo a patch file for current changelog
Split off ms-wpi task to separate class; fix tasks relying on talking to jenkins; building ms-wpi is not part of standard build anymore