Jp2 upload support

* Updates the upload form to allow jp2 extension.
* Adds logic to use the uploaded jp2 for both the OBJ and JP2 datatreams.
* Updates DScomposite to allow jp2 as mime type in OBJ.
* Adds test to make sure jp2 can be uploaded and destroyed

This replaces https://github.com/Islandora/islandora_solution_pack_large_image/pull/86.

It address a narrower scope of https://jira.duraspace.org/browse/ISLANDORA-921