feat(switch): match latest angular material animation

ng2-material/components/switcher/switch.scss

@@ -93,9 +93,13 @@ md-switch {
     .md-switch-bar,
     .md-switch-thumb-container,
     .md-switch-thumb {
-      transition: all 0.08s linear;
+      transition: $swift-linear;
       transition-property: transform, background-color;
     }
+    .md-switch-bar,
+    .md-switch-thumb {
+      transition-delay: 0.05s;
+    }
   }
 
 }

ng2-material/core/style/variables.scss

@@ -79,3 +79,7 @@ $swift-ease-in: all $swift-ease-in-duration $swift-ease-in-timing-function !defa
 $swift-ease-in-out-duration: 0.5s !default;
 $swift-ease-in-out-timing-function: cubic-bezier(0.35, 0, 0.25, 1) !default;
 $swift-ease-in-out: all $swift-ease-in-out-duration $swift-ease-in-out-timing-function !default;
+
+$swift-linear-duration: 0.08s !default;
+$swift-linear-timing-function: linear !default;
+$swift-linear: all $swift-linear-duration $swift-linear-timing-function !default;