Handle coffee cache issue when doing gulp watch

Need to clear cache before calling 'coffee' task repeatedly (from gulp watch).
This is due to caching:
  .pipe remember 'coffee-cache'
Gulp watch calls this multiple times in the same session and seems to compile
already compiled coffeescript files after the first time it's called.
gulp-remember remembers all files that have been passed through it; compiled .js
files must be getting added to the cache