Adds update action for collections.  Currently quite simple, doesn't allow for altering a parent or identifier.
Merge branch 'feature/collections' of https://github.com/nu-lts/drs-sufia-app into feature/collections

Merging in David's changes.
Updated method embargo_in_effect? to reflect that calling 'depositor' on a collection object now returns the name of the depositor already peeled out of its array.
Merge branch 'feature/collections' of https://github.com/nu-lts/drs-sufia-app into feature/collections

Merging in David's changes.
edit_collection_spec does not open a single web page every time you run it now.