adding sharing logic (just saving work in progress)
another local commit to share url
progress on share link
revised date validation for url
added full share url share to the template
fixed duplicate entries from share link and tweaked the share interface
fixed whitespace
fix interface actions that should only be displayed to collection admins
changing the share url to only allow student access to the collection (per discussion with jazahn and mike)
merged dev into bchau_branch
Merge pull request #70 from Harvard-ATG/bchau_branch

feature/share-collection