Fix gcc error on newer Ubuntus; add gemspec.#13

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huerlisi wants to merge 2 commits intoevan:masterfrom

huerlisi:master

Commits on Jul 2, 2012

Fix gcc error when compiled with -Werror=format-security
gregoryp
committed

Commits on Sep 3, 2012

Add gemspec to be able to use :git source in bundler.
huerlisi
committed