PageMetadata doesn't reject empty pages anymore if they're used with 1-indexed Pageables. Also tweaked the assertions to only reject negative values for now.
We need to have a different XML element name for PagedResources as it can be used as root element and JAXB cannot tell the difference between Resource and PagedResource otherwise.
Removed JsonAutoDetect annotations from PagedResources as the reference to Visibility was causing compile errors in case one of the 2 Jackson variants was not on the classpath (which by design will usually be the case). Generally, the annotations weren't required anymore so that we could remove them.
Added Jackson 2 dependencies. Doubly annotated representation model classes with both Jackson 1 and Jackson 2 annotations. Added Integration tests for Jackson 2 marshaling provided by Jon. Polished template.mf.
Added correct equals(…)/hashCode() methods to PagedResource, PageMetadata. Polished toString() methods of ResourceSupport, Resource, Resources and PagedResources. Added factory method to PagedResources to easily create a plain instance from a set of entities.
