In irb I can create an object and then create a new subsession with
that object as the context.
For example in irb I can type
  $psauto = PSAuto::Automator.new
  irb $psauto

Now I can call all the methids of $psauto without having to type the
'$psauto' each time.

Is it possible to put these two lines into an irb config file so that
I do not have to type them every time I start irb?