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New classes are introduced to represent HTTP messages and their associated bodies. The parser interface is reworked to use CRTP, error codes, and trait checks. New classes: * basic_headers Models field/value pairs in a HTTP message. * message Models a HTTP message, body behavior defined by template argument. Parsed message carries metadata generated during parsing. * parser Produces parsed messages. * empty_body, string_body, basic_streambuf_body Classes used to represent content bodies in various ways. New functions: * read, async_read, write, async_write Read and write HTTP messages on a socket. New concepts: * Body: Represents the HTTP Content-Body. * Field: A HTTP header field. * FieldSequence: A forward sequence of fields. * Reader: Parses a Body from a stream of bytes. * Writer: Serializes a Body to buffers. basic_parser changes: * add write methods which throw exceptions instead * error_code passed via parameter instead of return value * fold private member calls into existing callbacks * basic_parser uses CRTP instead of virtual members * add documentation on Derived requirements for CRTP impl/http-parser changes: * joyent renamed to nodejs to reflect upstream changes