Follow Drupal Coding Standards for islandora_scholar

Also changed the upload form to use a managed_file, rather than just a file as
it reduced the required code, and it is more consistant with the other forms
islandora presents.

Coding Standards have not yet been applied to the sub modules.
Altered islandora_scholar_add_usage_and_version_elements_to_mods()

Now deletes all occurances of usage/version elements regardless of
location within the document.