2.2.0
- FIX: Return empty string instead of null in AbstractList::__toString
- DOC: Branch alias 2.1 for the service config has been changed
- DOC: Fix typo in AttrEscaper::__invoke() doc comment
- DOC: Fix typo in HelperLocator::has() doc comment
- ADD: Add Helper/AnchorRaw for anchors w/ unescaped text; adds the helper, the factory to the locator, and the test.
- DOC: Various fixes to soothe PHPDocumentor.