Update for Net-TS Asio (API Change):

fix #769

The following classes are removed:

* handler_type
* async_result
* async_completion
* is_dynamic_buffer
* is_const_buffer_sequence
* is_mutable_buffer_sequence
* handler_alloc

Actions Required:

* Use BOOST_ASIO_HANDLER_TYPE instead of handler_type
* Use BOOST_ASIO_INITFN_RESULT_TYPE instead of async_result
* Use boost::asio::async_completion
* Use boost::asio::is_dynamic_buffer
* Use boost::asio::is_const_buffer_sequence
* Use boost::asio::is_mutable_buffer_sequence
* boost::asio::associated_allocator_t replaces handler_alloc

include/boost/beast/http/basic_parser.hpp

@@ -515,7 +515,7 @@ public:
 
 #if ! BOOST_BEAST_DOXYGEN
     std::size_t
-    put(boost::asio::const_buffers_1 const& buffer,
+    put(boost::asio::const_buffer const& buffer,
         error_code& ec);
 #endif