Enable completion command

[pivotaljohn]

Describe the problem/challenge you have
When #126 came by, we responded by disabling the automatic inclusion of the completion command (see 5bed2f0) because out of the box, that functionality was not compatible with kbld's UI display.

Describe the solution you'd like
Figure out where those incompatibilities are and address them so that users can enjoy the bliss of tab-completion.

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[aaronshurley]

Thanks for creating this issue. This is currently unprioritized but welcome to contributions.