clean up thumbnail layout
handle empty values for folder to_export method. Closes #262
freeze jquery ui gem at 4.2 series. 5.0 just released causes issues. Add devise cas gem
migration to add username field and index to users table. Needed for CAS

updated scheme with username column in users

first attempt at CAS integration

casify all controllers for now

clean up blacklight display, controller code
Add basic modal with osd in overlay

seperate view for oversize OSD dialog

Improve Image Integration

modal fix
Merge pull request #275 from pulibrary/viewer_enhancements

Viewer enhancements
Merge pull request #276 from pulibrary/development

Improve Integration, Enable CAS, Bugfixes for UI.