Update Gradle wrapper to v1.11
Merge pull request #30 from jle/upgrade_gradle_wrapper

Update Gradle wrapper to v1.11
Set stalker extension defaults for java projects.

Update README.md to reflect latest changes for stalker extension defaults.
Iterate over all sourceSets instead of hardcoding them.

* Fix bug where classpath directory was incomplete, buildDir.name was used
instead of the buildDir.path
* Improve logging by moving log messages to closure for inputs.
Merge pull request #35 from Lien/set-defaults-java

Set stalker extension defaults for java projects.
Merge branch 'master' into get_changes_with_jgit