Log Message:
Updated package to latest version, 2.5.1. Changes include:
	* Lwt_stream.on_terminate -> Lwt_stream.on_termination
  * Lwt_unix: handle O_CLOEXEC
  * Lwt_log: add OSX syslog path
  * Ppx: Improve lwt%match, improve catchall detection
  * Add Lwt_unix.file_exists and Lwt_unix.Large_file.file_exists
  * Build fixes
  * API CHANGE: Functions in Lwt_io that were previously using a
    ~buffer_size argument now takes a ~buffer argument.
  * Accept ?buffer argument in Lwt_ssl.{in,out}_channel_of_descr.
  * Use newer Ssl bigarray read/write functionality to avoid
    allocation in Lwt_ssl.
  * Fix non-reentrant function calls (#136)
  * IPv4 multicast support.
  * Add support for if%lwt in ppx extension.
  * Add Lwt.return_some.
  * Disable log syntax extension by default in ppx.
    Give [-log] as ppx argument to enable it.
  * Nanosecond precision for Lwt_unix.stat.
  * Minor fixes + documentation improvements.
  * Fix compilation under Windows (#117, #129)
  * Fix Lwt_engine.on_timer (#121)
  * Add Lwt_log_core.reset_rules (#123)
  * Fixed typos in the documentation (#119, #131)
  * camlp4 is now optional.
  * Add safe_string compliance except for Lwt_ssl (need ocaml-ssl fix).
  * Add Lwt.Infix module to open instead of Lwt to have (>>=), etc.
  * Add Lwt_list.filter_map_{s,p} functions.
  * Add Lwt.fail_{with,invalid_arg} functions.
  * Improved Android support.
  * Remove deprecated lwt.text and lwt.top libraries.
  * Remove deprecated Lwt_signal and Lwt_event modules from
    lwt.react.
  * Fix #111: try_lwt wrongly warns about unused match case.
  * Fix #96: Fix Lwt_react.S.limit and Lwt_react.E.limit.
  * Fix #91: Workaround to fix compilation on OSX.
  * Add a ppx syntax extension
  * Add a ?fd argument to
    Lwt_io.{open_connection,with_connection,establish_server}.
  * Fix stub for getaddrinfo and getprotobyname
  * Windows fix: don't throw an exception in the notification handler
    if we're shutting down
  * Fix include file search in ./configure
  * ./configure fixes for windows
  * Fix: use sys_exit instead of exit when Unix.execv fails