chore: rubocop

chore: fix api test conventions

chore: rubocop -A spec/

chore: more rubocop -A

fix failing test

rubocop fixes

removes helper methods that are in my opinion dead code

more rubocop fixes

rubocop -a --auto-gen-config

db/migrate/20160217194036_add_role_invoices_to_group.rb

@@ -1,5 +1,5 @@
 class AddRoleInvoicesToGroup < ActiveRecord::Migration[4.2]
   def change
-    add_column :groups, :role_invoices, :boolean, :default => false, :null => false
+    add_column :groups, :role_invoices, :boolean, default: false, null: false
   end
 end