Merge pull request #4 from rnc/master

Refactor internals (using VMan code) to use an internal Project rather t...
remove PomModifier in favor of PomIO after PR#4, and readjust ManipulationManager.
formats according to codestyle.xml in this project, and adding GPL license header to everything (with permission from vman, maven-versioning-extension, and maven-dependency-management-extension project owners...whose projects provided the original logic for many features here).