fix(gulp-plugins): fix potential race condition re: gulpfile.js
fix(gulp-plugins): fix potential race condition re: gulpfile.js

the `configure()` function in the spawn watcher could fail in some circumstances because because the task created by the call to `this.gulp.watch('./gulpfile.js')` does not actually signal completion, which can cause gulp to fail with a "did you forget to signal async completion?" error.

instead of trying to watch gulpfiles, we can just ignore them.  not ideal, but at least it won't break.

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