add render_while_loading #242

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1. janbiedermann

   added

   discussion

   on Feb 5, 2018
2. catmando commented on Feb 6, 2018

   

   catmando

   on Feb 6, 2018

   Contributor

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   for these we should use a call back

   class Foo < Hyperloop::Component
     while_loading do
       IMG(src: 'spinner.png')
      end
      ...
   end

   and to be completely consistent with the render call back it should allow the same signature as render:

   class Foo < Hyperloop::Component
     while_loading(IMG, src: 'spinner.png')
      ...
   end