Add support for encoding JSON object into a JSON string

Introduced a JsonObject field that will preserve the current JSON object. This field is set in BoxJSONObject.update. BoxJSONObject.toString is overriden to convert this object to a string literal.

Closes box#52.

src/main/java/com/box/sdk/BoxJSONObject.java

@@ -20,6 +20,11 @@ public abstract class BoxJSONObject {
      */
     private JsonObject pendingChanges;
 
+    /**
+     * The current JSON object
+     */
+    private JsonObject jsonObject;
+
     /**
      * A map of other BoxJSONObjects which will be lazily converted to a JsonObject once getPendingChanges is called.
      * This allows changes to be made to a child BoxJSONObject and still have those changes reflected in the JSON
@@ -181,7 +186,7 @@ void removePendingChange(String key) {
     }
 
     /**
-     * Updates this BoxJSONObject using the information in a JSON object.
+     * Updates this BoxJSONObject using the information in a JSON object and preserves the JSON object.
      * @param jsonObject the JSON object containing updated information.
      */
     void update(JsonObject jsonObject) {
@@ -192,7 +197,7 @@ void update(JsonObject jsonObject) {
 
             this.parseJSONMember(member);
         }
-
+        this.jsonObject = jsonObject;
         this.clearPendingChanges();
     }
 
@@ -214,4 +219,13 @@ private JsonObject getPendingJSONObject() {
         }
         return this.pendingChanges;
     }
+
+    /**
+     * Converts the JSON object into a string literal.
+     * @return a string representation of the JSON object.
+     */
+    @Override
+    public String toString() {
+        return jsonObject.toString();
+    }
 }

src/main/java/com/box/sdk/BoxUser.java

@@ -719,6 +719,14 @@ public Info() {
             super();
         }
 
+        /**
+         * Constructs an Info object by parsing information from a JSON string.
+         * @param  json the JSON string to parse.
+         */
+        public Info(String json) {
+            super(json);
+        }
+
         Info(JsonObject jsonObject) {
             super(jsonObject);
         }