licenses: Add tornado license information.

We are using a modified version of some code which originates from
the tornado web server project. Therfore we include the original license
information in our project to comply to the license.

licenses/tornado_license.txt

@@ -0,0 +1,13 b''
+# Copyright 2009 Facebook
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.

LICENSE.txt

@@ -1,690 +1,692 b''
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License, version 3
 (only), as published by the Free Software Foundation.
 
 
 This program incorporates work covered by the following copyright and
 permission notice:
 
    Copyright (c) 2014-2016 - packaging
        file:
    Copyright (c) 2008-2011 - msgpack-python
        file:licenses/msgpack_license.txt
+   Copyright (c) 2009 - tornado
+       file:licenses/tornado_license.txt
 
-Both licensed under the Apache License, Version 2.0 (the "License");
+All licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
     http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
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 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 imitations under the License.
 
 
 Below is the full text of GNU Affero General Public License, version 3
 
 
                     GNU AFFERO GENERAL PUBLIC LICENSE
                        Version 3, 19 November 2007
 
  Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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  of this license document, but changing it is not allowed.
 
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 the "copyright" line and a pointer to where the full notice is found.
 
     <one line to give the program's name and a brief idea of what it does.>
     Copyright (C) <year>  <name of author>
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU Affero General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
 
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Affero General Public License for more details.
 
     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 Also add information on how to contact you by electronic and paper mail.
 
   If your software can interact with users remotely through a computer
 network, you should also make sure that it provides a way for users to
 get its source.  For example, if your program is a web application, its
 interface could display a "Source" link that leads users to an archive
 of the code.  There are many ways you could offer source, and different
 solutions will be better for different programs; see section 13 for the
 specific requirements.
 
   You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU AGPL, see
 <http://www.gnu.org/licenses/>.