app/views/shared/_page_export.html.haml
= button_to '/download_table', {method: :post, class: 'button btn btn-mini export-button',
params: {'file_contents' => @tsv}} do
%i(class="fa fa-download" aria-hidden="true")
%span{style: "font-family: 'Helvetica Neue',Helvetica,Arial,sans-serif"}
Download as TSV