Banjo properties

* Added a number of properties to Node, Work, File, ImageFile, Copy.
* Removed some properties on Page as they were on the wrong object.
* Changed Copy to ensure that an ImageFile is created when the mimeType starts with "image" 
* Added tests for the Copy change
* DRY'ed up the Ingest tests to share some common methods
* Bumped version numbers in README and pom.