add emulator args to escript for faster load time

rebar.config

@@ -9,6 +9,7 @@
  [getopt, merl, erlydtl, erlware_commons, relx,  providers, rebar]}.
 {escript_top_level_app, rebar}.
 {escript_name, rebar3}.
+{escript_emu_args, "%%! +sbtu +A0 -noinput -mode minimal\n"}.
 
 {erl_opts,
  [{platform_define, "R14", no_callback_support},