owncloud: Add support for documents
owncloud: Add support for documents

Fixes: https://bugzilla.gnome.org/706074

felipeborges/gnome-online-accounts,ritzk/gnome-online-accounts,halfline/gnome-online-accounts,dnohales/gnome-online-accounts,halfline/gnome-online-accounts,dnohales/gnome-online-accounts,felipeborges/gnome-online-accounts,ritzk/gnome-online-accounts,Distrotech/gnome-online-accounts,dnohales/gnome-online-accounts,halfline/gnome-online-accounts,Distrotech/gnome-online-accounts,Distrotech/gnome-online-accounts,ritzk/gnome-online-accounts,felipeborges/gnome-online-accounts