multipart/form-data (RFC2388) parser for ocaml

This is a parser for structured form data based on Lwt_stream in order to use it with cohttp. You can use it to send POST parameters.

There are two APIs:

• a high-level one: parse_stream and get_parts. It works for strings, but has some problems with files.
• a low-level one: parse. It works for well for both strings and files.