(refs #108)Add ZIP download button to the repository viewer tab.

src/main/scala/app/RepositoryViewerController.scala

@@ -11,6 +11,7 @@ import org.eclipse.jgit.api.Git
 import org.eclipse.jgit.lib._
 import org.apache.commons.io.FileUtils
 import org.eclipse.jgit.treewalk._
+import org.eclipse.jgit.api.errors.RefNotFoundException
 
 class RepositoryViewerController extends RepositoryViewerControllerBase 
   with RepositoryService with AccountService with ReferrerAuthenticator
@@ -186,6 +187,7 @@ trait RepositoryViewerControllerBase extends ControllerBase {
       using(Git.cloneRepository
           .setURI(getRepositoryDir(repository.owner, repository.name).toURI.toString)
           .setDirectory(cloneDir)
+          .setBranch(revision)
           .call){ git =>
 
         // checkout the specified revision

src/main/twirl/repo/tab.scala.html

@@ -26,4 +26,9 @@
       <input type="text" value="@repository.url" id="repository-url" readonly>
     }
   </li>
+  <li class="pull-right" style="margin-right: 8px;">
+    <div class="pull-right">
+      <a href="@{url(repository)}/archive/@{id}.zip" class="btn"><i class="icon-download-alt"></i>ZIP</a>
+    </div>
+  </li>
 </ul>

src/main/webapp/assets/common/css/gitbucket.css

@@ -426,7 +426,7 @@ pre.commit-description {
 #repository-url {
   background-color: white;
   cursor: default;
-  width: 350px;
+  width: 300px;
 }
 
 ul#commit-file-list {