improve aesthetics.
return ok to confirm to user that his/her command was executed well/successfully.
return the result only here, and let the Runner take care of outputting whatever result to the end user.
output result of command execution to end user.
access instance variables of table object required in table test.
test commands. there are integration-style tests here as well, since command centre is really the driver of the whole application, called by runner (tiny bit of code that gets user input from command line).
test robot.
test table.
test the whole app. provide ability to run the whole test suite.
remove not needed.