[openstreetmap-website] Changeset discussion feature (#772)

[Tom Hughes]

> +    # Return a copy of the updated changeset
> +    render :action => :show
> +  end
> +
> +  ## 
> +  # Removes a subscriber from the changeset
> +  def unsubscribe 
> +    # Check the arguments are sane
> +    raise OSM::APIBadUserInput.new("No id was given") unless params[:id]
> +
> +    # Extract the arguments
> +    id = params[:id].to_i
> +
> +    # Find the changeset and check it is valid
> +    @changeset = Changeset.find(id)
> +    raise OSM::APINotFoundError unless @changeset

Same comment as above.

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https://github.com/openstreetmap/openstreetmap-website/pull/772/files#r15402587
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