Merge pull request #1 from kohsuke/master

Fixed class loader constraint violation
Add Hamcrest, too. So the Test-Task runs at least partially
Remote Tests are working
Close Cli-Channel when ending Communication
Cleanup
Removed unnecessary code to set the ApplicationClassLoader
Modified Readme
more README
Get processBuilderFactory via Dependency Injection
Make maxParallelForks work again
Typo
Doc improvements