Added tasks controller, spec, JS, apitesthelper

Had an issue with calling render_views in the specs to render the
jbuilder json templates and also getting the devise sign_in method to
work, ended up adding a helper to add the username/password for a user

config/routes.rb

@@ -24,6 +24,8 @@ Velocipede::Application.routes.draw do
       post 'bikes/create' => "bikes#create", as: "api_create_bike"
 
       get  'task_lists/:id' => "task_lists#show",   as: "api_task_list"
+
+      put  'tasks/update' => "tasks#update", as: "api_update_task"
     end
   end