XMl Formatter maven plugin

Implementation of maven XML formatter plugin basd on
http://code.google.com/p/xml-formatter/.
Configure UTF-8 ad default project encoding
Convert Release maven plugin to annotation-based maven plugin
Formatting XML files

Formatting project XML files (not only POMs). Fixes #291 and it is a
rework of PR #402.
Merge pull request #448 from imartinezortiz/pom-formatting

XML Formatting maven plugin