dependencies prevent bap + core-lwt install

[dbrumley]

When trying to install core-lwt with ocaml 4.03.0:

• core-lwt -> core_kernel < v0.9.0 -> sexplib < 113.25.00
• bap -> core_kernel >= v0.9

When compiling with core_kernel v0.9.0 and lwt 3.1.0 installed:

File "lib/core_lwt_basic.ml", line 4, characters 19-165:
Error: Signature mismatch:
       ...
       Values do not match:
         val bind : 'a Lwt.t -> ('a -> 'b Lwt.t) -> 'b Lwt.t
       is not included in
         val bind : 'a t -> f:('a -> 'b t) -> 'b t
       File "lib/core_lwt_basic.ml", line 7, characters 8-12:
         Actual declaration