make domain objects serializable

src/main/java/com/printnode/api/Account.java

@@ -1,13 +1,15 @@
 package com.printnode.api;
 
 
+import java.io.Serializable;
+
 /**
  * Account object.
  * When being used, will generally be created via the blank constructor.
  * The other constructor is for CreateAccountJson,
  * which requires firstname, lastname, email and password to be set.
  * */
-public class Account {
+public class Account implements Serializable {
 
     /**
      * Id of this account. Not set if made from CreateAccountJson.

src/main/java/com/printnode/api/Auth.java

@@ -1,10 +1,12 @@
 package com.printnode.api;
 
+import java.io.Serializable;
+
 /**
  * Auth class required for any APIClient creation.
  * Will throw an exception if neither ApiKey or EmailPassword are set.
  * */
-public class Auth {
+public class Auth implements Serializable {
 
     /**
      * API-Key to authenticate with.

src/main/java/com/printnode/api/Capabilities.java

@@ -3,6 +3,8 @@
 import com.google.gson.JsonObject;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
+
+import java.io.Serializable;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
@@ -12,7 +14,7 @@
  * PrintNode API Docs Link:
  * <a href=https://www.printnode.com/docs/api/curl/#printer-capabilitie://www.printnode.com/docs/api/curl/#printer-capabilities>Capabilities</a>
  * */
-public class Capabilities {
+public class Capabilities implements Serializable {
 
     /**
      * The response body.

src/main/java/com/printnode/api/Client.java

@@ -1,10 +1,13 @@
 package com.printnode.api;
 
 import com.google.gson.JsonObject;
+
+import java.io.Serializable;
+
 /**
  * Object for a client.
  * */
-public class Client {
+public class Client implements Serializable {
 
     /**
      * The body of the response that made this client.

src/main/java/com/printnode/api/Computer.java

@@ -2,10 +2,12 @@
 
 import com.google.gson.JsonObject;
 
+import java.io.Serializable;
+
 /**
  * Object for a computer.
  * */
-public class Computer {
+public class Computer implements Serializable {
 
     /**
      * The respose body that made this computer.

src/main/java/com/printnode/api/Download.java

@@ -2,10 +2,12 @@
 
 import com.google.gson.JsonObject;
 
+import java.io.Serializable;
+
 /**
  * Object for latest downloadable clients.
  * */
-public class Download {
+public class Download implements Serializable {
 
     /**
      * The response body that made this Download.

src/main/java/com/printnode/api/Options.java

@@ -1,9 +1,11 @@
 package com.printnode.api;
 
+import java.io.Serializable;
+
 /**
  * Object to be serailized into JSON in createPrintJob.
  * */
-public class Options {
+public class Options implements Serializable {
 
     /**
      * Which bin you want to use....

src/main/java/com/printnode/api/PrintJob.java

@@ -2,10 +2,12 @@
 
 import com.google.gson.JsonObject;
 
+import java.io.Serializable;
+
 /**
  * Object for a PrintJob.
  * */
-public class PrintJob {
+public class PrintJob implements Serializable {
 
     /**
      * The response body that made this PrintJob.

src/main/java/com/printnode/api/Printer.java

@@ -2,10 +2,12 @@
 
 import com.google.gson.JsonObject;
 
+import java.io.Serializable;
+
 /**
  * Object for a printer.
  * */
-public class Printer {
+public class Printer implements Serializable {
 
     /**
      * The response body that made this Printer.

src/main/java/com/printnode/api/Scale.java

@@ -3,14 +3,16 @@
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
+
+import java.io.Serializable;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
 
 /**
  * Object for a Whoami.
  * */
-public class Scale {
+public class Scale implements Serializable {
 
     /**
      * response body that made this Whoami.

src/main/java/com/printnode/api/State.java

@@ -2,10 +2,12 @@
 
 import com.google.gson.JsonObject;
 
+import java.io.Serializable;
+
 /**
  * Object for a State.
  * */
-public class State {
+public class State implements Serializable {
 
     /**
      * The response body that made this State.

src/main/java/com/printnode/api/Whoami.java

@@ -3,14 +3,16 @@
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
+
+import java.io.Serializable;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
 
 /**
  * Object for a Whoami.
  * */
-public class Whoami {
+public class Whoami implements Serializable {
 
     /**
      * response body that made this Whoami.