Tweaking AsyncExecutorTest
Spring Boot docs + cleaning up Spring Boot integration. Example can be found at https://github.com/jbarrez/spring-boot-activiti-example/
Merge branch 'master' of https://github.com/Activiti/Activiti

# By Tijs Rademakers
# Via Tijs Rademakers
* 'master' of https://github.com/Activiti/Activiti:
  Added highlights for 5.17.0 release
  Fix stupid OSGi test typo issue
  Updated documentation
  Add support to get variables when starting a process instance