Refactor all examples:

fix #575, fix #604, fix #608, fix #634, fix #712

All examples are rewritten:

* Using Best Practices
* Mostly self-contained
* New examples to complete the feature matrix
* The server-framework example is removed

example/websocket/server/Jamfile

@@ -0,0 +1,20 @@
+#
+# 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)
+#
+# Official repository: https://github.com/boostorg/beast
+#
+
+build-project async ;
+build-project coro ;
+build-project fast ;
+build-project stackless ;
+build-project sync ;
+
+# VFALCO How do I make this work on Windows and if OpenSSL is not available?
+#build-project async-ssl ;
+#build-project coro-ssl ;
+#build-project stackless-ssl ;
+#build-project sync-ssl ;