[BUGFIX beta] Ensure 'use strict'; remover comments are not stripped.

[rwjblue]

Somewhere throughout our build pipeline, leading comments are being stripped. This meant that the REMOVE_USE_STRICT comments could not be found, and the modules were still in strict mode when they should not have been.

[stefanpenner]

Nice. This is likely a better solution.

@rwjblue I won't if the recent babel stuff was the reason?

[rwjblue]

Yes, either the switch to Esperanto or adding babel caused this. In general comments aren't handed quite right, and these comments were being completely stripped from the build output. I didn't take too much time trying to figure out which of the tools was the culprit though.

[stefanpenner]

LGTM