Fix compilation on recent ocamlnet, gcc.#3

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vbmithr wants to merge 14 commits intojaked:masterfrom

Commits on Aug 8, 2013

Fix compilation on recent ocamlnet, gcc.
Vincent Bernardoff
committed

Commits on Aug 9, 2013

Now works fine on my system.
Vincent Bernardoff
committed
Removed pcre as a (direct) dependency in _tags.
Vincent Bernardoff
committed

Commits on Oct 4, 2013

Commits on Oct 10, 2013

Changed some vocabulary to be in sync with the revised OAuth spec.
vbmithr
committed

Commits on Jan 27, 2014

Replaced status by status_code in functor.
vbmithr
committed