- Make sure to send the subdirectory when restarting a build

- Make sure to use the subdirectory to read the Dockerfile's location in a build package, and display the path
- Nicer UI for showing the trigger description in the build view
- Fix an NPE in the file change tree

static/directives/trigger-description.html

@@ -9,7 +9,7 @@
         </a>
       </span>
     </div>
-    <div style="margin-top: 4px; margin-left: 26px; font-size: 12px; color: gray;" ng-if="!trigger.config.subdir">
+    <div style="margin-top: 4px; margin-left: 26px; font-size: 12px; color: gray;" ng-if="!trigger.config.subdir && !short">
       <span>Dockerfile:
         <a href="https://github.com/{{ trigger.config.build_source }}/tree/{{ trigger.config.master_branch || 'master' }}/Dockerfile" target="_blank">
           //Dockerfile