ticket:184 fix js for applying filters, when a number is in 'data-filters' attribute
ticket:187 add 'clear cart' button
Merge branch 't184_filter_input_missing_after_setting_filters'
ticket:187 removed hardcoded widths for cart buttons
Merge branch 't187_add_clear_cart_button'
ticket:186 obtain home page url for reset button via reverse
Merge branch 't186_filter_reset_button_broken'
ticket:188 pretty print for manifest and metadata xml
Merge branch 't188_manifest_metadata_xml_pretty_ptint'
ticket:189 3 buttons in cart: manifest, metadata, summary
ticket:189 buttons on cart page
ticket:189 updated cart.min.js version
Merge branch 't189_download_summary_tsv_button'