Squashed 'src/beast/' changes from 06f74f0..9f10b11

9f10b11 Set version to 1.0.0-b28
195f974 Fix HTTP split parse edge case:
264fd41 Restyle async result constructions
572a0eb Split out and rename test stream classes
95b6646 Tidy up some WebSocket javadocs
f6938d3 Set version to 1.0.0-b27
a6120cd Update copyright dates
c7bfe7d Add documentation building instructions
f6c91ce Tidy up tests and docs:
f03985f Move basic_streambuf to streambuf.hpp (API Change):
b8639a7 Invoke callback on pings and pongs (API Change):

git-subtree-dir: src/beast
git-subtree-split: 9f10b11eff58aeb793b673c8a8cb6e2bee3db621

test/core/to_string.cpp

@@ -1,5 +1,5 @@
 //
-// Copyright (c) 2013-2016 Vinnie Falco (vinnie dot falco at gmail dot com)
+// Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -8,3 +8,21 @@
 // Test that header file is self-contained.
 #include <beast/core/to_string.hpp>
 
+#include <beast/unit_test/suite.hpp>
+#include <boost/asio/buffer.hpp>
+
+namespace beast {
+
+class to_string_test : public beast::unit_test::suite
+{
+public:
+    void run()
+    {
+        BEAST_EXPECT(to_string(boost::asio::const_buffers_1("x", 1)) == "x");
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(to_string,core,beast);
+
+} // beast
+