Rename command from bin/run to bin/flash.
Flash::Runner receives all args at initialization.
Rename Flash::Runner to Flash::Run.

Better mapping of 'flash run' command to class file.
Support new 'flash run' command instead of old 'run'.
Require both command and group at initialization time.
Directly pass args in the executable.
Basic test coverage for the Flash::CLI class.
Added a class to handle unkjown commands.
Refactored the flash/cli class.
Merge pull request #2 from colmarius/flash-command

Add "flash" as main command instead of "run"