Fix tree table overflow

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/sections/tree.scss

@@ -49,6 +49,7 @@
 
   .tree-item {
     .tree-item-file-name {
+      max-width: 320px;
       vertical-align: middle;
       a {
         &:hover {
@@ -62,6 +63,10 @@
       }
     }
 
+    .tree_commit {
+      max-width: 320px;
+    }
+
     .tree_time_ago {
       min-width: 135px;
     }