Removed use of static configuration holder in favour of dependency injection. Fail early instead of logging if no server url has been configured.
Moved .groovy source file from src/java into src/groovy
Indentation with four spaces
Fix: XML entities are now being escaped according to the sitemap standard.
Improved XmlEntityWriter testability.
Introduced a enum type for change frequency, fail early for priorities outside the interval [0, 1]
Bumped plugin version to 0.7
Don't add sitemaps without a previous modification date to the index sitemap
Bumped plugin version
Merge pull request #1 from kimble/master

kimble's 0.7.1 version