Hide feature non-member users can't use

Fixes #206
Fixes #244

client/components/sidebar/sidebar.jade

@@ -43,8 +43,9 @@ template(name="labelsWidget")
       each currentBoard.labels
           a.card-label(class="card-label-{{color}}").js-label
             span.card-label-name= name
-      a.card-label.add-label.js-add-label
-        i.fa.fa-plus
+      if currentUser.isBoardAdmin
+        a.card-label.add-label.js-add-label
+          i.fa.fa-plus
 
 template(name="memberPopup")
   .board-member-menu

client/components/sidebar/sidebarArchives.jade

@@ -5,12 +5,13 @@ template(name="archivesSidebar")
     each archivedCards
       .minicard-wrapper.js-minicard
         +minicard(this)
-      p.quiet
-        a.js-restore-card Restore
-        | -
-        a.js-delete-card Delete
-      if cardIsInArchivedList
-        p.quiet.small (warning: this card is in an archived list)
+      if currentUser.isBoardMember
+        p.quiet
+          a.js-restore-card Restore
+          | -
+          a.js-delete-card Delete
+        if cardIsInArchivedList
+          p.quiet.small (warning: this card is in an archived list)
     else
       p.no-items-message No archived cards.
 
@@ -18,8 +19,9 @@ template(name="archivesSidebar")
     ul.archived-lists
       each archivedLists
         li.archived-lists-item
-          button.js-restore-list
-            i.fa.fa-undo
+          if currentUser.isBoardMember
+            button.js-restore-list
+              i.fa.fa-undo
           = title
       else
         li.no-items-message No archived lists.