Merge branch 'css-fix' into 'master'

CSS fix: 1px border on hover of last item in tree view

I messed up my fork repository and hat to recreate it. So I closed MR !77 and created this one instead. Sorry for any inconvenience.

@dzaporozhets: I changed the code and just added one line as you suggested.

This merge request fixes issue #101.

app/assets/stylesheets/sections/tree.scss

@@ -28,6 +28,7 @@
       }
       td {
         border-color: #F1F1F1 !important;
+        border-bottom: 1px solid;
       }
       &:hover {
         td {