add album downloading and rewrite cache

views/downloadAlbum.handlebars

@@ -0,0 +1,9 @@
+<form class="download-form" action="/api/downloadAlbum" method="get">
+    <select name="codec">
+        {{#each codecs as |codec|}}
+            <option value="{{codec}}">{{codec}}</option>
+        {{/each}}
+    </select>
+    <input type="hidden" name="id" value="{{id}}">
+    <input type="submit" value="download!">
+</form>

views/partials/download.handlebars

@@ -1,5 +1,9 @@
 {{#if id}}
-    <a href="/download?id={{id}}">dl</a>
+    {{#if isAlbum}}
+        <a href="/downloadAlbum?id={{id}}">dl</a>
+    {{else}}
+        <a href="/download?id={{id}}">dl</a>
+    {{/if}}
 {{else}}
     <span class="light">dl</span>
 {{/if}}

views/partials/result.handlebars

@@ -5,6 +5,7 @@
             <h2>{{name}}</h2>
             <span class="light">{{arrayJoin artists ", "}}</span>
         </div>
+        {{> download}}
     </div>
     <hr>
     <ol class="result-tracklist">