Editor and Group assignment fields to fieldsets

Nest editor and group assignment fields within their own fieldsets.

HYDRASIR-383
Perform all tests within form partial

HYDRASIR-383
Add view legends and annotations

HYDRASIR-383
Merge branch 'develop' into feature/HYDRASIR-383-editors_of_work_to_separate_fieldset

Conflicts:
	config/locales/sufia.en.yml
Editor and Group assignment fields to fieldsets

Nest editor and group assignment fields within their own fieldsets.

HYDRASIR-383
Perform all tests within form partial

HYDRASIR-383
Add view legends and annotations

HYDRASIR-383
Merge branch 'feature/HYDRASIR-383-editors_of_work_to_separate_fieldset' of https://github.com/projecthydra/curate into feature/HYDRASIR-383-editors_of_work_to_separate_fieldset
Merge pull request #497 from projecthydra/feature/HYDRASIR-383-editors_of_work_to_separate_fieldset

Feature/hydrasir 383 editors of work to separate fieldset