User can now provide a Function or an ApplicationInitializer. Also the initializer can create a FunctionRegistration with the handler name instead of a bean with the handler name. Better control of input and output types that way. Fixes gh-231
User can now provide a Function or an ApplicationInitializer. Also the initializer can create a FunctionRegistration with the handler name instead of a bean with the handler name. Better control of input and output types that way. Fixes gh-231