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/stackless-ssl/CMakeLists.txt

@@ -0,0 +1,23 @@
+#
+# 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
+#
+
+GroupSources(include/boost/beast beast)
+GroupSources(example/common common)
+GroupSources(example/websocket/server/stackless-ssl "/")
+
+add_executable (websocket-server-stackless-ssl
+    ${BOOST_BEAST_INCLUDES}
+    ${PROJECT_SOURCE_DIR}/example/common/server_certificate.hpp
+    Jamfile
+    websocket_server_stackless_ssl.cpp
+)
+
+target_link_libraries (websocket-server-stackless-ssl
+    ${OPENSSL_LIBRARIES}
+    )