First pass at fixing the destroy function. Also adds an attempt at a destro path that links to a button on the myPrisms page next to each person's created prisms.
Fixes the functionality for the destroy function on prisms. Also, the destroy function is working now. It appears as a third button in the myprisms page.
Fixes the destroy method, which before would only authorize on the prisms but go ahead and delete the other associated elements. Also sets up user roles.
Adds a couple files that weren't tracked.
Fixes things for real.
Adds a prompt asking them to confirm the destroy.
Updates markup and styles for delete link.

Refs #267.
merge develop branch
pulling cancan
pulls cancan and adds gravatar image.
Adds a rescue block to redirect users who attempt to delete prisms they do not 'own' fixes #279
Merge branch 'feature/cancan' of github.com:scholarslab/prism into feature/cancan
Gets rid of the destroy button on the highlighted prisms section.
Trying to pull develop…
Merges feature/cancan.