Extraneous typo crept in before commit
Initial version of off-arduino stdio based tester

This allows interactive testing of arduino command hosts while not
on an arduino, and specifically testing from the condole - which
makes it much quicker to spot issues.

Specifically:
   * Has support for shutting the script down
   * A means for using a self-diagnostic or running with an .ino file
   * Demo/test of usage from a script
   * Initial tweaks to command host tiny based on feedback from testing -
     specifically some API consistency changes
   * Could be used with "expect" for testing (but isn't yet)
Fix Command tiny command host for arbitrary functions