feat(ripple): only enable ripple on android 5 or greater

ionic/platform/platform.ts

@@ -110,6 +110,16 @@ export class Platform {
     return this._versions;
   }
 
+
+  version() {
+    for (let platformName in this._versions) {
+      if (this._versions[platformName]) {
+        return this._versions[platformName];
+      }
+    }
+    return {};
+  }
+
   /**
    * @returns {promise}
    * @description

ionic/platform/registry.ts

@@ -47,6 +47,9 @@ Platform.register({
     'tablet'
   ],
   settings: {
+    activator: function(p) {
+      return (p.version().major >= 5) ? 'ripple' : 'none';
+    },
     hoverCSS: false,
     keyboardHeight: 300,
     mode: 'md',