Resolve "Add stub handler for received invalid message"

Closes #18 (closed)

dist/adapter.esm.js

           if (validation.valid) {
             const type = this.protocol.getType(parsed);
             this.protocol.decode(type, parsed);
-          } 
+          } else {
+            this.protocol.receivedInvalid(parsed, validation);
+          }
         });
         return response;
       })

dist/adapter.js

           if (validation.valid) {
             const type = this.protocol.getType(parsed);
             this.protocol.decode(type, parsed);
-          } 
+          } else {
+            this.protocol.receivedInvalid(parsed, validation);
+          }
         });
         return response;
       })

dist/protocol.esm.js

     return message;
   }
 
+
+  /**
+   * Invoked on receiving an invalid message from the backbone 
+   * 
+   * @param {object} message 
+   * @param {object} validation
+   * @returns {*}
+   */
+  receivedInvalid(message, validation) {
+    return message;
+  }
+
   /**
    * Optionally invoked before delivering a message to the backbone
    * 

dist/protocol.js

     return message;
   }
 
+
+  /**
+   * Invoked on receiving an invalid message from the backbone 
+   * 
+   * @param {object} message 
+   * @param {object} validation
+   * @returns {*}
+   */
+  receivedInvalid(message, validation) {
+    return message;
+  }
+
   /**
    * Optionally invoked before delivering a message to the backbone
    * 

src/adapter/index.js

           if (validation.valid) {
             const type = this.protocol.getType(parsed);
             this.protocol.decode(type, parsed);
-          } 
+          } else {
+            this.protocol.receivedInvalid(parsed, validation);
+          }
         });
         return response;
       })

src/protocol/index.js

     return message;
   }
 
+
+  /**
+   * Invoked on receiving an invalid message from the backbone 
+   * 
+   * @param {object} message 
+   * @param {object} validation
+   * @returns {*}
+   */
+  receivedInvalid(message, validation) {
+    return message;
+  }
+
   /**
    * Optionally invoked before delivering a message to the backbone
    *