All tests pass, but in development: "ActiveRecord::RecordInvalid in
UserInvitationsController#create
Validation failed: Campaign can't be blank"
Updated branch with styling merged into master.

Merge branch 'master' of https://github.com/slyeargin/phonebanking into feature/add-devise-invitable

Conflicts:
	Gemfile
	app/views/campaigns/show.html.haml
Updated branch with styling merged into master.  Also, form works in
development - PEBKAC.

Merge branch 'master' of https://github.com/slyeargin/phonebanking into feature/add-devise-invitable

Conflicts:
	Gemfile
	app/views/campaigns/show.html.haml
Correct alerts now show up after invitation is sent.
Merge branch 'feature/add-devise-invitable' of https://github.com/slyeargin/phonebanking into feature/add-devise-invitable
Mailgun added to config/production.rb
Merge pull request #6 from slyeargin/feature/add-devise-invitable

Feature/add devise invitable