Implemented strong_parameters for Invite/InvitesController.

The email parameter is now required using strong parameters and will throw ActionController::ParameterMissing if it is missing. If the email address is incorrect or invalid, Discourse::InvalidParameters will still be thrown.

app/controllers/invites_controller.rb

@@ -29,7 +29,7 @@ class InvitesController < ApplicationController
   end
 
   def destroy
-    requires_parameter(:email)
+    params.require(:email)
 
     invite = Invite.where(invited_by_id: current_user.id, email: params[:email]).first
     raise Discourse::InvalidParameters.new(:email) if invite.blank?

app/models/invite.rb

@@ -1,6 +1,7 @@
 require_dependency 'trashable'
 
 class Invite < ActiveRecord::Base
+  include ActiveModel::ForbiddenAttributesProtection
   include Trashable
 
   belongs_to :user

spec/controllers/invites_controller_spec.rb

@@ -17,7 +17,7 @@ describe InvitesController do
 
 
       it 'raises an error when the email is missing' do
-        lambda { delete :destroy }.should raise_error(Discourse::InvalidParameters)
+        lambda { delete :destroy }.should raise_error(ActionController::ParameterMissing)
       end
 
       it "raises an error when the email cannot be found" do