update(switch): fixed switch movement speed

Closes #4581. Closes #4816.

src/components/switch/demoBasicUsage/index.html

@@ -20,6 +20,6 @@
   </md-switch>
 
   <md-switch ng-model="data.cb6" aria-label="Switch 6" ng-change="onChange(data.cb6)">
-    Switch 6 message: {{ message }}
+    Switch (onChange) state: {{ message }}
   </md-switch>
 </div>

src/components/switch/demoBasicUsage/script.js

@@ -6,7 +6,9 @@ angular.module('switchDemo1', ['ngMaterial'])
     cb5: false
   };
 
+  $scope.message = 'false';
+
   $scope.onChange = function(cbState) {
-  	$scope.message = "The switch is now: " + cbState;
+  	$scope.message = cbState;
   };
 });

src/components/switch/switch.scss

@@ -114,7 +114,7 @@ md-switch {
     .md-bar,
     .md-thumb-container,
     .md-thumb {
-      transition: $swift-ease-in-out;
+      transition: $swift-linear;
       transition-property: transform, background-color;
     }
     .md-bar,

src/core/style/variables.scss

@@ -99,6 +99,10 @@ $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;
+
 // Fab Buttons (shared between buttons.scss and fab*.scss)
 // -------------------------------------------
 $button-fab-width: rem(5.600) !default;