added sort feature for viewing of cards

client/components/boards/boardHeader.jade

@@ -31,6 +31,9 @@ template(name="boardHeaderBar")
             if $eq watchLevel "muted"
               i.fa.fa-bell-slash
             span {{_ watchLevel}}
+          a.board-header-btn.js-sort-cards(title="Sort Cards")
+            i.fa.fa-sort
+            | Sort By {{sortCardsBy.get}}
 
         else
           a.board-header-btn.js-log-in(
@@ -247,3 +250,19 @@ template(name="boardChangeTitlePopup")
 template(name="boardCreateRulePopup")
   p {{_ 'close-board-pop'}}
   button.js-confirm.negate.full(type="submit") {{_ 'archive'}}
+
+
+template(name="cardsSortPopup")
+  ul.pop-over-list
+    li
+      a.js-sort-due Due Date
+      hr
+    li
+      a.js-sort-title Title(Alphabetically)
+      hr
+    li
+      a.js-sort-created-desc Created At(Newest First)
+      hr
+    li
+      a.js-sort-created-asc Created At(Oldest First)
+