Section distributionManagement removed from pom.xml

- The section mentions legacy java.net-m2-repository, new maven.jenkins-ci.org should be used instead.
- Other plugins doesn't contain the section at all (e.g. Warnings, Android Lint), so the remove should be safe.
- https://wiki.jenkins-ci.org/display/JENKINS/Hosting+Plugins
Merge pull request #24 from mixalturek/master

Section distributionManagement removed from pom.xml