Adds a theses and dissertation checkbox to the community create admin action.
Getting the personal folder type of a Collection that isn't a personal folder now returns nil instead of raising a generic RuntimeException.
Add a convenience method for returning the theses significant folder of a Community.
Remove an overly optimistic comment suggesting that Personal Folders might some day wind up being their own class of object.
Add mass permission dropdown to the new/update form for communities.
Merge branch 'develop' into feature/theses_and_dissertations

Mergin'
Conditionally display option to add theses/dissertation on community edit, refactor controller code.
Merge pull request #176 from nu-lts/feature/theses_and_dissertations

Feature/theses and dissertations