Switch Sky to pointer events

sky/framework/sky-checkbox/sky-checkbox.sky

Index: sky/framework/sky-checkbox/sky-checkbox.sky
diff --git a/sky/framework/sky-checkbox/sky-checkbox.sky b/sky/framework/sky-checkbox/sky-checkbox.sky
index 14db2c6f0a8e8d3be8f64a4439f2ab10c38f0eb9..766f2354f593d6fe330710e5cd616b4972d38814 100644
--- a/sky/framework/sky-checkbox/sky-checkbox.sky
+++ b/sky/framework/sky-checkbox/sky-checkbox.sky
@@ -8,7 +8,7 @@
 <sky-element
     name="sky-checkbox"
     attributes="checked:boolean"
-    on-mouseup="handleMouseUp">
+    on-click="handleClick">
 <template>
   <style>
     :host {
@@ -65,7 +65,7 @@ module.exports = class extends SkyButton {
   highlightChanged(oldValue, newValue) {
     this.containerStyle = newValue ? 'highlight' : '';
   }
-  handleMouseUp() {
+  handleClick() {
     this.checked = !this.checked;
   }
 }.register();