Easing help request validations

Prior to this change, the /404 page for Curate was rendering and
throwing a silent error (with a redirect to the help request form
without a meaningful error message).

Also ensuring that when a user submits an invalid form, that the
submitted values are preserved (instead of obliterated).

@JIRA DLTP-269 #under_review
Merge pull request #71 from jeremyf/easing-help-request-validation

Easing help request validations
DLTP-265 Add affiliation to works

Adding affilation list  as a enumerator and include name and label as i8n
Include affiliation as qualified DC and populate in all repository models
Include affilation metadata to all works and populate form field
adding helper method for affiliation and removing incorrect spec
Adding spec for affiliation
Include affiliation as part new work type
Fixed failing spec