Add javascript callback for "assignee"

To make intrgration with external trackers easier, add JS API for
assignee retrieval.  It returns a script that calls a function that
should act somehow depending on how it was defined.

app/controllers/platforms/maintainers_controller.rb

@@ -40,7 +40,10 @@ class Platforms::MaintainersController < ApplicationController
         ret[:error] = 'Not found'
       end
     end
-    render :json => ret
+    respond_to do |format|
+      format.json {render :json => ret}
+      format.js {@ret = ret}
+    end
   end
 
   protected

app/views/platforms/maintainers/assignee.js.erb

@@ -0,0 +1 @@
+doHandleAbfAssignee(<%= @ret.to_json.html_safe %>);

config/routes.rb

@@ -51,6 +51,7 @@ Rosa::Application.routes.draw do
   # Maintainer Database API
   # (package name may contain dots, numbers, and all kinds of weird symbols, hence the :constraints relaxation)
   match 'api/json/maintdb/assignee/:platform_id/:package' => 'platforms/maintainers#assignee', :format => :json, :constraints => { :package => /.*/ }
+  match 'api/js/maintdb/assignee/:platform_id/:package' => 'platforms/maintainers#assignee', :format => :js, :constraints => { :package => /.*/ }
 
   scope :module => 'platforms' do
     resources :platforms do