Merge branch 'master' into UIMA-6263-CAS-validation-support-v3

* master: (129 commits)
  [UIMA-6264] Switch from DocBook to Asciidoc
  [UIMA-6257] Jenkinsfile for uimaFIT
  [UIMA-6257] Jenkinsfile for uimaFIT
  [UIMA-6257] Jenkinsfile for uimaFIT
  [UIMA-6257] Jenkinsfile for uimaFIT
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release uimafit-3.1.0
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release uimafit-3.1.0
  [NO JIRA] Adjust UIMA version in the NOTICE file of the binary distribution
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release uimafit-3.1.0
  [NO JIRA] Update documentation to changed API in ExternalResourceFactory and removed a spurious character
  [NO JIRA] Adjusted comparison version for API change report
  [NO JIRA] Updated README file for release.
  [NO JIRA] Updated README file for release.
  [UIMA-6214] Method signature class in ExternalResourceFactory
  Update an Eclipse metadata file.
  [UIMA-5847] Remove UV3 bug workarounds in FSCollectionFactory
  [UIMA-6216] Upgrade to UIMA Core 3.1.1
  ...

# Conflicts:
#	README
#	pom.xml
#	uimafit-parent/pom.xml