Restructure joyent message parser (from Node.js):

* New http::raw_parser wrapper
* Convert parser errors to error_code
* Enumeration and strings for parsed HTTP method
* Move parser engine into joyent namespace
* Rename includes to be distinct

beast/asio/Asio.cpp

@@ -27,3 +27,4 @@
 #include "tests/shared_handler_tests.cpp"
 
 #include "abstract_socket.cpp" // TEMPORARY!
+