Adapt the test site script to simple API's naming change of SimpleRWC to SimpleReadiumJs.
Adapt the test site script to simple API's naming change of SimpleRWC to
SimpleReadiumJs.

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