Provide a constructor that captures the JSON

Rather than "debug" the JSON which does not allow further processing for the exception capture and put it inside the exception data.

json-path/src/main/java/com/jayway/jsonpath/InvalidJsonException.java

@@ -17,18 +17,42 @@ package com.jayway.jsonpath;
 @SuppressWarnings("serial")
 public class InvalidJsonException extends JsonPathException {
 
+    /**
+     * Problematic JSON if available.
+     */
+    private final String json;
+    
     public InvalidJsonException() {
+        json = null;
     }
 
     public InvalidJsonException(String message) {
         super(message);
+        json = null;
     }
 
     public InvalidJsonException(String message, Throwable cause) {
         super(message, cause);
+        json = null;
     }
 
     public InvalidJsonException(Throwable cause) {
         super(cause);
+        json = null;
+    }
+    
+    /**
+     * Rethrow the exception with the problematic JSON captured.
+     */
+    public InvalidJsonException(final Throwable cause, final String json) {
+        super(cause);
+        this.json = json;
+    }
+    
+    /**
+     * @return the problematic JSON if available.
+     */
+    public String getJson() {
+        return json;
     }
 }