Don't load startup_ijulia.jl with --startup-file=no (JuliaLang#748)

Author: timholy

src/kernel.jl

@@ -9,7 +9,7 @@ end
 IJulia.init(ARGS)
 
 startupfile = abspath(homedir(), ".julia", "config", "startup_ijulia.jl")
-isfile(startupfile) && Base.include(Main, startupfile)
+isfile(startupfile) && Base.JLOptions().startupfile != 2 && Base.include(Main, startupfile)
 
 # import things that we want visible in IJulia but not in REPL's using IJulia
 import IJulia: ans, In, Out, clear_history