Ensure the LiveResource module's list of resources is initialized so
that we don't, for example, get an uninitialized error when calling
LiveResource::stop when no resources have been registered.

lib/live_resource.rb:
  Instead of using a @@resources class variable, make a private
  LiveResource.resources method that lazily initializes a class-level
  'resources' instance variable.  All LiveResource module methods
  now call 'resources'.

lib/live_resource/console.rb:
  Access LiveResource.resources the correct way now that @@resources
  no longer exists.