Apply canonical ordering in pom.xml files using tidy:pom, see
http://maven.apache.org/developers/conventions/code.html#POM_Code_Convention
Merge pull request #76 from ppalaga/141204-tidy-pom

Apply canonical ordering in pom.xml files using tidy:pom, see
http://maven.apache.org/developers/conventions/code.html#POM_Code_Convention