Hides OSD controls on stanford-only images for non-WebAuthed users
Shortens PURL links for embeds < 400px
Removes 'No image selected' download text for embeds < 300px
Merge pull request #207 from sul-dlss/remove-osd-controls

Hides OSD controls on stanford-only images for non-WebAuthed users
Merge pull request #210 from sul-dlss/footer-layout

Updates to footer contents
Updates PURL link to open in parent window