Move benchmarks to a separate project

test/benchmarks/Jamfile

@@ -0,0 +1,15 @@
+#
+# 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)
+#
+
+unit-test benchmarks :
+    ../../extras/beast/unit_test/main.cpp
+    buffers.cpp
+    nodejs_parser.cpp
+    parser.cpp
+    :
+    <variant>coverage:<build>no
+    ;