allow duplicate event hooks; cleanup docs
allow duplicate event hooks; cleanup docs

Carreau/phosphor-notebook-old-orig,Carreau/phosphor-notebook-old-orig,Carreau/phosphor-notebook-old-orig,dwillmer/phosphor,dwillmer/phosphor,KesterTong/phoshpor-notebook,dwillmer/phosphor,blink1073/phosphor,blink1073/phosphor,dwillmer/phosphor,KesterTong/phoshpor-notebook,phosphorjs/phosphor,phosphorjs/phosphor,KesterTong/phoshpor-notebook