Correct reference counting and handling of NULL pointers in new OCaml bindings.#2

Merged

wintersteiger merged 2 commits intowintersteiger:new-ml-apifrom martin-neuhaeusser:ml_api_patch2

Apr 5, 2016

+514-521

Commits on Apr 3, 2016

Fix reference counting in the C layer of the OCaml bindings
martin-neuhaeusser
committed

Commits on Apr 4, 2016

Translate correctly between OCaml option values and NULL pointers
martin-neuhaeusser
committed