Merged latest changes from ‘Netflix/gradle-template’ single-project branch
BasicScheduler unit tests improved
fixed a PMD warning
Merge pull request #105 from radonsky/merge_latest_gradle_template

Merged latest changes from ‘Netflix/gradle-template’ single-project branch
Merge pull request #106 from radonsky/improve_basicscheduler_unit_test

BasicScheduler unit tests improved
fix image cleanup
Merge pull request #107 from Yelp/yejun_fix_image_cleanup

fix image cleanup