restored npm postinstall to fix installing from a git repository (was removed in 5eab0c5)
restored npm postinstall to fix installing from a git repository (was removed in 5eab0c5)

PeterDaveHello/brunch,hellyeahllc/brunch,Flaise/brunch,brunch/brunch,lalomartins/brunch,kidaa/brunch,rlugojr/brunch,hayesgm/brunch,justinwoo/brunch,ondreian/brunch