Merge pull request #3 from svasek/master

Fixing upgrade issue with ant-contrib in version 1.8
Merge pull request #4 from svasek/master

Build files are now automaticaly deleted by default
[maven-release-plugin] prepare release antexec-1.9
[maven-release-plugin] prepare for next development iteration
Merge pull request #11 from jenkinsci/master

Release-1.9