adds map to chapter show page that shows all of the posts from that chapter
Merge branch 'master' of https://github.com/pocus/mondiale
adds acts_as_votable to gemfile
creates the acts_as_commentable migration
adds acts_as_votable to trip model
adds member route for vote
adds a link to upvote a trip
 added a vote method to the controller that upvotes the trip
the upvote button now fires a javascript request