WIP user dash, can make requests, withdraw
Merge branch 'development' into user_dash
specs for mailing admins on withdrawn request
Admins can view list of all users and their requests
Add solr doc id info about artifact to user dash

Artifacts shown on user dash now link back to the original document.
Test in place for activeadmin to ensure requested artifacts appear in
admin interface. More tests to come soon for admin stuff.
Merge pull request #114 from WGBH/user_dash

User dash