Disallow rollup=never PRs and allow pending PRs to be rolled up

Author: Manishearth

homu/html/queue.html

@@ -166,7 +166,7 @@ <h1>Homu queue - {% if repo_url %}<a href="{{repo_url}}" target="_blank">{{repo_
                 {% for state in states %}
                 <tr class="{{state.greyed}}">
                     <td class="hide">{{loop.index}}</td>
-                    <td><input type="checkbox" data-num="{{state.num}}" {{ '' if state.status == 'approved' else 'disabled' }}></td>
+                    <td><input type="checkbox" data-num="{{state.num}}" {{ '' if ((state.status == 'approved' or (state.status == 'pending' and !state.try_)) and state.rollup != 'never') else 'disabled' }}></td>
                     {% if multiple %}
                     <td><a href="{{state.repo_url}}">{{state.repo_label}}</a></td>
                     {% endif %}