Root object to_s is "main" when $0 == "-e"
Defining override `to_s `/`inspect` on singleton top `self` only
Moving the top `self` singleton methods into lib-topaz

which may be a horrible idea, but it let me move `def self.include` as
well, which *I think* is preferable to having the `self.execute` string.

Potentially making a mess.  Needs guidance.  And more coffee.
Fixing top-level `to_s`/`inspect`

to always be "main" as with MRI.
Merge pull request #439 from modcloth/dash-e-self-is-main

Root object to_s is "main" when $0 == "-e"