Made the root element parent to all subsequent elements.

The form now uses //mods:mods[1] as the root element, this allows MODS documents
that use the mods:modsCollection element as the root element to work with the
form. All references to the document context save the root element have been
changed to a parent context.

This is required to use the Large Image Form with the MARCXML generated MODS.
Merge pull request #44 from nigelgbanks/7.x-form-fixes

Made the root element parent to all subsequent elements.
Allow use of all FedoraObject in derivative processing.

Used to add derivatives to objects before they are actually ingested
in a batch.
Merge pull request #46 from adam-vessey/7.x

Allow use of all FedoraObjects in derivative processing.
Change to attempt to reconstruct JP2 derivative with the -no_palette flag set if kakadu warns us about it.