#57779212 Added PeerGroup model, create from emails on new survey if a peer group name is given.
Validate both survey and peer group before saving either, so we don't get stuck half way.
#59340250 Added PeerGroupsController and #index
#59340250 Allow editing PeerGroup#name with best_in_place gem.
Use best_in_place from GitHub, due to: http://stackoverflow.com/a/18713842/21115.
Added pry-rails.
Added pry-debugger
#59340250 Allow email address list for a peer group to be edited