loosen jsdom dependency
loosen jsdom dependency

@mikelehen might want to bump npm version for this, jsdom 3.x doesn’t
play so hot on node 5.x

abhishekgahlot/firepad,Unrestricted-Coding/firepad-rethinkdb,shadowcodex/firepad-rethinkdb,missive/firepad,Unrestricted-Coding/firepad-rethinkdb,missive/firepad,abhishekgahlot/firepad,shadowcodex/firepad-rethinkdb,kofifus/firepad,kofifus/firepad