Added basic data types + header parsing to determine HTTP version + connection type:

private-libwebsockets:
 - enum http_version and http_connection_type
 - http struct: +request_verison +connection_type

server.c:
 - lws_handshake_server:
 - * default http_version to 1.0, unless otherwise specified by the client
   * connection_type:
   * - default to "close" for HTTP/1.0
     - default to "keep-alive" for HTTP/1.1
     - override with explicit value of "Connection:" HTTP header