refactor(android)!: Remove unused code (#183)

diff --git a/src/android/Device.java b/src/android/Device.java
index de281d3..b1a213d 100644
--- a/src/android/Device.java
+++ b/src/android/Device.java
@@ -18,8 +18,6 @@
 */
 package org.apache.cordova.device;
 
-import java.util.TimeZone;
-
 import org.apache.cordova.CordovaWebView;
 import org.apache.cordova.CallbackContext;
 import org.apache.cordova.CordovaPlugin;
@@ -31,14 +29,10 @@
 import android.provider.Settings;
 
 public class Device extends CordovaPlugin {
-    public static final String TAG = "Device";
 
-    public static String platform;                            // Device OS
     public static String uuid;                                // Device UUID
 
     private static final String ANDROID_PLATFORM = "Android";
-    private static final String AMAZON_PLATFORM = "amazon-fireos";
-    private static final String AMAZON_DEVICE = "Amazon";
 
     /**
      * Constructor.
@@ -62,7 +56,7 @@
      * Executes the request and returns PluginResult.
      *
      * @param action            The action to execute.
-     * @param args              JSONArry of arguments for the plugin.
+     * @param args              JSONArray of arguments for the plugin.
      * @param callbackContext   The callback id used when calling back into JavaScript.
      * @return                  True if the action was valid, false if not.
      */
@@ -92,79 +86,46 @@
     /**
      * Get the OS name.
      *
-     * @return
+     * @return "Android"
      */
     public String getPlatform() {
-        String platform;
-        if (isAmazonDevice()) {
-            platform = AMAZON_PLATFORM;
-        } else {
-            platform = ANDROID_PLATFORM;
-        }
-        return platform;
+        return ANDROID_PLATFORM;
     }
 
     /**
      * Get the device's Universally Unique Identifier (UUID).
      *
-     * @return
+     * @return android.provider.Settings.Secure.ANDROID_ID
      */
     public String getUuid() {
-        String uuid = Settings.Secure.getString(this.cordova.getActivity().getContentResolver(), android.provider.Settings.Secure.ANDROID_ID);
-        return uuid;
+        return Settings.Secure.getString(this.cordova.getActivity().getContentResolver(), android.provider.Settings.Secure.ANDROID_ID);
     }
 
     public String getModel() {
-        String model = android.os.Build.MODEL;
-        return model;
-    }
-
-    public String getProductName() {
-        String productname = android.os.Build.PRODUCT;
-        return productname;
+        return android.os.Build.MODEL;
     }
 
     public String getManufacturer() {
-        String manufacturer = android.os.Build.MANUFACTURER;
-        return manufacturer;
+        return android.os.Build.MANUFACTURER;
     }
 
     public String getSerialNumber() {
-        String serial = android.os.Build.SERIAL;
-        return serial;
+        return android.os.Build.SERIAL;
     }
 
     /**
      * Get the OS version.
      *
-     * @return
+     * @return android.os.Build.VERSION.RELEASE
      */
     public String getOSVersion() {
-        String osversion = android.os.Build.VERSION.RELEASE;
-        return osversion;
+        return android.os.Build.VERSION.RELEASE;
     }
 
     public String getSDKVersion() {
         return String.valueOf(android.os.Build.VERSION.SDK_INT);
     }
 
-    public String getTimeZoneID() {
-        TimeZone tz = TimeZone.getDefault();
-        return (tz.getID());
-    }
-
-    /**
-     * Function to check if the device is manufactured by Amazon
-     *
-     * @return
-     */
-    public boolean isAmazonDevice() {
-        if (android.os.Build.MANUFACTURER.equals(AMAZON_DEVICE)) {
-            return true;
-        }
-        return false;
-    }
-
     public boolean isVirtual() {
 	return android.os.Build.FINGERPRINT.contains("generic") ||
 	    android.os.Build.PRODUCT.contains("sdk");