removed colour coding from wear link, closes #206

  style="color: rgb({{ 30|sub:total_warmth|mul:255|intdiv:30 }},
{{total_warmth|mul:255|intdiv:150}} , {{ total_warmth|mul:255|intdiv:30
}});"
added "smart drop out" to remove items from filter easily

closes #207
still need to test
Front end updated to take in items for filtering in the 4 categories
filtering backend works
drag and drop ui update
tests updated. closes #208
closes #203
adds a grey overlay for loading on ajax calls