Restore BL's authorship attribution, and add "The Jsoncpp Authors" where it was missing.

Requested/noticed in https://github.com/open-source-parsers/jsoncpp/pull/610, and a
followup to https://github.com/open-source-parsers/jsoncpp/pull/607 .
diff --git a/src/jsontestrunner/main.cpp b/src/jsontestrunner/main.cpp
index 45db464..c4cfa05 100644
--- a/src/jsontestrunner/main.cpp
+++ b/src/jsontestrunner/main.cpp
@@ -1,4 +1,4 @@
-// Copyright 2007-2010 Baptiste Lepilleur
+// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index ec79075..23d732c 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -1,4 +1,4 @@
-// Copyright 2007-2011 Baptiste Lepilleur
+// Copyright 2007-2011 Baptiste Lepilleur and The JsonCpp Authors
 // Copyright (C) 2016 InfoTeCS JSC. All rights reserved.
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
diff --git a/src/lib_json/json_tool.h b/src/lib_json/json_tool.h
index 41d0f49..4316178 100644
--- a/src/lib_json/json_tool.h
+++ b/src/lib_json/json_tool.h
@@ -1,4 +1,4 @@
-// Copyright 2007-2010 Baptiste Lepilleur
+// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
diff --git a/src/lib_json/json_value.cpp b/src/lib_json/json_value.cpp
index 5f5cf8b..056c475 100644
--- a/src/lib_json/json_value.cpp
+++ b/src/lib_json/json_value.cpp
@@ -1,4 +1,4 @@
-// Copyright 2011 Baptiste Lepilleur
+// Copyright 2011 Baptiste Lepilleur and The JsonCpp Authors
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
diff --git a/src/lib_json/json_valueiterator.inl b/src/lib_json/json_valueiterator.inl
index b45162b..5243bfe 100644
--- a/src/lib_json/json_valueiterator.inl
+++ b/src/lib_json/json_valueiterator.inl
@@ -1,4 +1,4 @@
-// Copyright 2007-2010 Baptiste Lepilleur
+// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index 4fb186d..02f1cb1 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -1,4 +1,4 @@
-// Copyright 2011 Baptiste Lepilleur
+// Copyright 2011 Baptiste Lepilleur and The JsonCpp Authors
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
diff --git a/src/test_lib_json/jsontest.cpp b/src/test_lib_json/jsontest.cpp
index 4c10a37..f8c0767 100644
--- a/src/test_lib_json/jsontest.cpp
+++ b/src/test_lib_json/jsontest.cpp
@@ -1,4 +1,4 @@
-// Copyright 2007-2010 Baptiste Lepilleur
+// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
diff --git a/src/test_lib_json/jsontest.h b/src/test_lib_json/jsontest.h
index f0ba1fa..955317d 100644
--- a/src/test_lib_json/jsontest.h
+++ b/src/test_lib_json/jsontest.h
@@ -1,4 +1,4 @@
-// Copyright 2007-2010 Baptiste Lepilleur
+// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
diff --git a/src/test_lib_json/main.cpp b/src/test_lib_json/main.cpp
index 47cd981..44f6591 100644
--- a/src/test_lib_json/main.cpp
+++ b/src/test_lib_json/main.cpp
@@ -1,4 +1,4 @@
-// Copyright 2007-2010 Baptiste Lepilleur
+// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE