Fixed: Collection movement list count

Fixes #214

Author: AFFogarty

elvis/templates/collection/collection_detail.html

@@ -134,7 +134,7 @@ <h3>Pieces ({{ content.pieces | length }})</h3>
     {% endif %}
 
     {% if content.movements %}
-        <h3>Movements ({{ content.movement_count }})</h3>
+        <h3>Movements ({{ content.movements | length }})</h3>
         <table class="table" id="mov-table">
             <colgroup>
                 <col class="text-center" style="width: 5%;">