Add 'Decline invitation' link to users' feedbacks page
Restrict invitation decline permissions to admins/user who has been invited (with tests)
Add popup warning and sensible success message when invitation declined
Refactor table layout to take advantage of auto-formatting and (hopefully) be more extensible
updated reviews index action for graduated ACs
Merge pull request #81 from ajablonski/declineRequests

#372 - Decline requests for feedback
Merge pull request #82 from bsmith3541/updateForGraduatedACs

updated reviews index action for graduated ACs
Update contributors page and separate current/past contributors
Merge pull request #83 from ajablonski/updateContributors

Update contributors page and separate current/past contributors