Rename function argument for a more descriptive name.
Rename function argument for a more descriptive name.

bibliolabs/readium-js,readium/readium-js,looknear/readium-js,bibliolabs/readium-js,kivuto/readium-js,ravn-no/readium-js,kivuto/readium-js,looknear/readium-js,ravn-no/readium-js,readium/readium-js