Add "Details" section to item view

Now information like: owner, state, taken {by, on, until} are presented
in the item page.

storage/templates/item.html

@@ -14,6 +14,26 @@
     </h2>
     <div class="row">
         <div class="col-md-4">
+            <h3>Details</h3>
+            <table class="table table-hover table-striped">
+                {% if item.owner %}
+                <tr><td>owner</td><td>{{ item.owner }}</td></tr>
+                {% endif %}
+
+                <tr><td>state</td><td>{{ item.state }}</td></tr>
+                {% if item.taken_by %}
+                <tr><td>taken by</td><td>{{ item.taken_by }}</td></tr>
+                {% endif %}
+
+                {% if item.taken_on %}
+                <tr><td>taken on</td><td>{{ item.taken_on }}</td></tr>
+                {% endif %}
+
+                {% if item.taken_until %}
+                <tr><td>taken until</td><td>{{ item.taken_until }}</td></tr>
+                {% endif %}
+            </table>
+
             <h3>Properties</h3>
             <table class="table table-hover table-striped">
                 <thead>