Remove redundant copyright notices from README files

The normative place for these for the entire project is COPYING,
and the main README already has a MIT license section.

README.md

@@ -5,8 +5,6 @@ Bitcoin Core integration/staging tree
 
 https://www.bitcoin.org
 
-Copyright (c) 2009-2014 Bitcoin Core Developers
-
 What is Bitcoin?
 ----------------
 

doc/README.md

@@ -1,9 +1,6 @@
-Bitcoin 0.10.99
+Bitcoin Core 0.10.99
 =====================
 
-Copyright (c) 2009-2014 Bitcoin Developers
-
-
 Setup
 ---------------------
 [Bitcoin Core](http://bitcoin.org/en/download) is the original Bitcoin client and it builds the backbone of the network. However, it downloads and stores the entire history of Bitcoin transactions (which is currently several GBs); depending on the speed of your computer and network connection, the synchronization process can take anywhere from a few hours to a day or more. Thankfully you only have to do this once. If you would like the process to go faster you can [download the blockchain directly](bootstrap.md).

doc/README_windows.txt

@@ -1,13 +1,5 @@
-Bitcoin 0.10.99
-
-Copyright (c) 2009-2014 Bitcoin Core Developers
-
-Distributed under the MIT software license, see the accompanying
-file COPYING or http://www.opensource.org/licenses/mit-license.php.
-This product includes software developed by the OpenSSL Project for use in
-the OpenSSL Toolkit (https://www.openssl.org/).  This product includes
-cryptographic software written by Eric Young ([email protected]).
-
+Bitcoin Core 0.10.99
+=====================
 
 Intro
 -----

src/test/data/README.md

@@ -6,9 +6,7 @@ This directory contains data-driven tests for various aspects of Bitcoin.
 License
 --------
 
-The data files in this directory are
-
-    Copyright (c) 2012-2014 The Bitcoin Core developers
-    Distributed under the MIT software license, see the accompanying
-    file COPYING or http://www.opensource.org/licenses/mit-license.php.
+The data files in this directory are distributed under the MIT software
+license, see the accompanying file COPYING or
+http://www.opensource.org/licenses/mit-license.php.