Updated package to latest version, 6.1.0. Changes include:

===== 6.1 (2016-12-20) =====

* Remove redundant dependency on calendar
* Permit client routing to "./"
* -y parameter for eliom-distillery (do not ask)
* Eliom_client: do not execute onload after OCaml services
* Permit suffix params in Eliom_service.create_attached_post

===== 6.0 (2016-12-08) =====

* Improve Eliom_service and Eliom_registration APIs using GADTs
* Implement client-side services, useful for mobile apps. This includes
** client-side service registration (Eliom_registration)
** client-side service routing (Eliom_client.change_page_uri)
* Transition to PPX internally
* Compatibility with
** OCaml 4.03.0 and 4.04.0
** Js_of_ocaml 2.8.2 and newer
** TyXML 4.0 and newer
* Various bugfixes and improvements

(jaapb)