mv get_repos_orgs() from storage.decorators to webui.__init__

Seems like it might fit in ddrlocal too, oh well.
rm unused media path functions from storage

These were causing confusion abotu which paths were which.
function for indicating target of MEDIA_BASE symlink, if any
add imports for relocated get_repos_orgs function
restore EAD/METS xml create functions; use templates from settings

I must have disabled this while I was refactoring and moving all
the metadata-level stuff from ddr to ddrlocal.

Uncommented the create() functions.
Get EAD, METS template paths from settings (the templates are
supposed to be copied into /etc/ddr/templates).
mkdir /etc/ddr/templates in updates.sh script
set proper permissions on XML templates in update.sh

For some reason, having XML templates with 755 perms was causing
Git not to be able to switch branches between master and git-annex
during the sync operation when run by Django/gunicorn/supervisord.
create collection ead.xml if it does not exist
Fix Preferred Citation label in entity form
Merge branch 'master' into 058-file-selector