replaced airbrake gem with party_foul and installed
added PartyFoul section to deploy script
removed airbrake from deploy.rb
added party_foul to production.rb
Merge branch 'master' into 501_party_foul (fresh Gemfile.lock)

Conflicts:
	Gemfile.lock
deleted config/deploy.rb
added placeholder initializer file
renamed party foul initializer so it won't load by default
Merge pull request #770 from YaleSTC/501_party_foul

resolves #501