Merge in v5 code

src/@ionic-native/core/ionic-native-plugin.ts

@@ -1,3 +1,6 @@
+import { checkAvailability } from './decorators/common';
+import { get } from './util';
+
 export class IonicNativePlugin {
 
   static pluginName: string;
@@ -16,31 +19,31 @@ export class IonicNativePlugin {
    * Returns a boolean that indicates whether the plugin is installed
    * @return {boolean}
    */
-  static installed(): boolean { return false; }
+  static installed(): boolean { return checkAvailability(this.pluginRef) === true; }
 
   /**
    * Returns the original plugin object
    */
-  static getPlugin(): any { }
+  static getPlugin(): any { return get(window, this.pluginRef); }
 
   /**
    * Returns the plugin's name
    */
-  static getPluginName(): string { return; }
+  static getPluginName(): string { return this.pluginName; }
 
   /**
    * Returns the plugin's reference
    */
-  static getPluginRef(): string { return; }
+  static getPluginRef(): string { return this.pluginRef; }
 
   /**
    * Returns the plugin's install name
    */
-  static getPluginInstallName(): string { return; }
+  static getPluginInstallName(): string { return this.plugin; }
 
   /**
    * Returns the plugin's supported platforms
    */
-  static getSupportedPlatforms(): string[] { return; }
+  static getSupportedPlatforms(): string[] { return this.platforms || []; }
 
 }