New package deriving-0.5

With the agrement of the orginal deriving authors [1], we renamed our
fork 'deriving-ocsigen' into 'deriving'. We may keep old packages in
'opam-repository' until we update the dependent packages
(js_of_ocaml/eliom) and while [2] isn't fixed.

[1] https://github.com/ocsigen/deriving/issues/5
[2] https://github.com/OCamlPro/opam/issues/740
Merge pull request #1020 from hnrgrgr/rename

New package deriving-0.5
Backports compilation patches for ocaml-4.01.0beta1
Added cpdf, a library of high-level PDF functions based on CamlPDF
Merge pull request #1021 from johnwhitington/master

Added cpdf, a library of high-level PDF functions based on CamlPDF
add erm_xmpp and erm_xml (dependencies for sulci jabber bot)
Merge pull request #1023 from camlunity/temp

add erm_xmpp and erm_xml (dependencies for sulci jabber bot)
Restrict patches to { ocaml-version >= 4.01.0 }
Merge pull request #1022 from hnrgrgr/master

Backports compilation patches for ocaml-4.01.0beta1
+ocamlnet.3.7.3