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/http/server/stackless-ssl/Jamfile

@@ -0,0 +1,21 @@
+#
+# Copyright (c) 2016-2017 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
+#
+
+project
+    : requirements
+    <library>ssl
+    <library>crypto
+    ;
+
+exe http-server-async-ssl :
+    http_server_async_ssl.cpp
+    :
+    <variant>coverage:<build>no
+    <variant>ubasan:<build>no
+    ;