Added a didInitialize hook for Nodes.
Added a didInitialize hook for Nodes.

andene/substance,jacwright/substance,podviaznikov/substance,abhaga/substance,andene/substance,stencila/substance,TypesetIO/substance,GerHobbelt/substance,DuncanAForbes/substance,jacwright/substance,michael/substance-1,GerHobbelt/substance,abhaga/substance,michael/substance-1,TypesetIO/substance,substance/substance,substance/substance,podviaznikov/substance,DuncanAForbes/substance