Inconsistent handling of alias/command conflicts

[grayside]

In our current pre-release we have rig project create. If we have a configured script with the alias create, the result is inconsistent:

• The built-in command is executed on rig project create
• The aliased help is displayed on rig project help create

Since this functionality is relying on the command controller implemented in https://github.com/urfave/cli, I think this needs an upstream fix.

[grayside]

Though per discussion and some of the ideas in #39 and #40, maybe we could validate the alias is non-conflicting and leave upstream to it's own devices.

[febbraro]

Resolved in #43