Log Message:
Updated ocaml-batteries to latest version 2.5.0, which adds support for
ocaml 4.03. Also, the package is now compatible with the latest version of
the ocaml.mk framework. Discussed on packages@ and OK'd by jperkin.

Changes include:
## v2.5.0
- BatTuple: add Tuple{N}.make : 'a1 -> ... -> 'an -> 'a1 * ... * 'an
  #657
  (Thibault Suzanne)
- BatBig_int: fix sequence operators (--), (---) to avoid polymorphic comparison
  #674, #675, #676
  (Pieter Goetschalckx and Cedric Cellier)
- Extend all Batteries module to cover OCaml 4.03 features
  #670
  (Gabriel Scherer, KC Sivaramakrishnan)

## v2.4.0

- BatBitSet: use Bytes instead of String
  (Gabriel Scherer)
- BatHashtbl: fix hash computation bug introduced by 4.01 (issue #609)
  (Gabriel Scherer, report by Martin Neuh?u?er)
- BatText: synchronize nsplit to match BatString.nsplit
  (Gabriel Scherer)
- BatLazyList: fix remove_all_such documentation
  (Xavier Van de Woestyne)
- BatMap: add pop_min_binding: 'a t -> (key * 'a) * 'a t
	  and pop_max_binding: 'a t -> (key * 'a) * 'a t
  (Francois Berenger)
- BatMap: add at_rank_exn: int -> ('key, 'a) t -> ('key * 'a)
	  and update: key -> key -> 'a -> 'a t -> 'a t
  (Francois Berenger)
- BatEnum: add interleave: 'a t array -> 'a t
  (Aleksey Z. Arens)
- BatFormat: expose asprintf for V>=4.01
  (Ralf Vogler)
- BatSet: add at_rank_exn: int -> t -> elt
	  and update: elt -> elt -> t -> t
  (Francois Berenger)
- BatUTF8: add enum: t -> BatUChar.t BatEnum.t
  (Kevin Brubeck Unhammer)
- BatSet: add to_array: t -> elt array
	  and of_array: elt array -> t
	  and test for to_list
  (Francois Berenger)
- BatSet: add pop_max: 'a t -> 'a * 'a t
	  and pop_min: 'a t -> 'a * 'a t
  (Francois Berenger)
- BatSplay: hardened against read-only-data compiler optimization
  (Gabriel Scherer)
- BatList: simplified interleave implementation
  (Francois Berenger)
- BatOption: add Infix.(>>=): 'a option -> ('a -> 'b option) -> \ 
'b option
  (Herry Herry)
- BatHashtbl: modify now have same semantics than replace for the key
  (Anders Fugmann)
- BatHashtbl: more efficient modify_opt and modify_def
  (Anders Fugmann)
- BatFormat: add pp_print_list: ?pp_sep:(formatter -> unit -> unit) ->
	                        (formatter -> 'a -> unit) ->
	                        (formatter -> 'a list -> unit)
	     and pp_print_text: formatter -> string -> unit
  (Christoph H?ger)
- BatEnum: add uniq_by: ('a -> 'a -> bool) -> 'a t -> 'a t
	   and uniqq: 'a t -> 'a t
  (Max Mouratov)
- BatEnum: fix uniq to use structural comparison
  (Max Mouratov)
- BatUnix: add run_and_read: string -> process_status * string
  (Francois Berenger)
- BatCache: use hashmap to speed up lru_cache
  (Sang Kil Cha)
- BatQueue: add filter: ('a -> bool) -> 'a t -> 'a t
	    and filter_inplace: ('a -> bool) -> 'a t -> unit
	    and filter_map: ('a -> 'b option) -> 'a t -> 'b t
(Gabriel Scherer)