hyper-component is not adding extensions to opal-jquery Element class #43

The desired state (that used to work) was if you required opal-jquery before loading hyper-component, then hyper-component would extend the opal-jquery Element class like this:

Element.class_eval do
  ... add stuff
end if Object.const_defined?('Element')

Between the new hyperstack loader, and opal 0.11 require mechanism Element is not getting defined until too late.

I can't find a fix, so will just make it so you can require this code manually after requiring jQuery.

Keep problem open unless we are sure a better solution can't be found.