Improve Mail module

- JSONinfied mail folder create and delete actions
- restored sgFolderTree directive
- extended folder types with "shared" and "otherUsers"
- added mailbox creation at the account level

UI/WebServerResources/scss/MailerUI.scss

@@ -148,8 +148,6 @@ $column-gutter: 0;
 
     #mailboxesList {
         position: absolute;
-        overflow: auto;
-        overflow-x: hidden;
         top: $topbar-height;
         bottom: 0;
         background-color: #333;
@@ -157,6 +155,36 @@ $column-gutter: 0;
         @media #{$medium-up} {
             @include grid-column($columns:3);
         }
+        .newItemsToolbar {
+            margin-top: rem-calc(6);
+            text-align: center;
+            text-transform: uppercase;
+        }
+        .scrollView {
+            position: absolute;
+            overflow: auto;
+            overflow-x: hidden;
+            top: $topbar-height;
+            bottom: 0;
+            right: 0;
+            left: 0;
+            label {
+                padding-right: 0;
+                button {
+                    float: right;
+                    background-color: transparent;
+                    padding: 0;
+                    margin: 0;
+                    width: 32px;
+                }
+            }
+        }
+        .buttonsToolbar {
+            border-top: $off-canvas-link-border-bottom;
+            position: absolute;
+            bottom: 0px;
+            width: 100%;
+        }
     }
 
     #messagesList, #messageEditor {