Disable debug and wrap until calls with a function to provide wait context

[barecode]

Proposed fix for #110

As part of this proposed change the set -x flag was removed, effectively disabling debug. I am not sure if that was left in for a reason, or simply missed. The net effect of this change does not surpress the reported errors, but makes the output a bit cleaner for someone to read and follow and provides a wrapper function waitUntil to promote reuse and a central place for changes.

[kaczyns]

@dacleyra Would you please comment on whether the set -x flag was left on intentionally? I suspect that it was.

[dacleyra]

I always write scripts with set -x such that the code & debug is present & understood.

If you want to make it pretty, and deal with behavioral questions after the fact, be my guest.

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