message: Adding equal and not equal operators to proxys.
diff: @@ -7894,6 +7894,20 @@ class basic_json
  {
  return proxy.key();
  }
  +
  + /// equal operator (calls key())
  + template<typename KeyType>
  + bool operator==(const KeyType& key)
  + {
  + return proxy.key() == key;
  + }
  +
  + /// not equal operator (calls key())
  + template<typename KeyType>
  + bool operator!=(const KeyType& key)
  + {
  + return proxy.key() != key;
  + }
  };
  /// helper class for second "property"
  @@ -7914,6 +7928,20 @@ class basic_json
  return proxy.value();
  }
  + /// equal operator (calls value())
  + template<typename ValueType>
  + bool operator==(const ValueType& value)
  + {
  + return proxy.value() == value;
  + }
  +
  + /// not equal operator (calls value())
  + template<typename ValueType>
  + bool operator!=(const ValueType& value)
  + {
  + return proxy.value() != value;
  + }
  +
  /// assignment operator (calls value())
  template<typename ValueType>
  iterator_value_property<ProxyType>& operator=(const ValueType& value)
  