docs: def clear_worker_output(self):
          """Drops all of the worker output collections"""
          
          print 'Dropping all of the worker output collections... Whee!'
          # Get all the collections in the workbench database
          all_c = self.database.collection_names()
  
          # Remove collections that we don't want to cap
          try:
              all_c.remove('system.indexes')
              all_c.remove('fs.chunks')
              all_c.remove('fs.files')
              all_c.remove('sample_set')
              all_c.remove('tags')
              all_c.remove(self.sample_collection)
          except ValueError:
              print 'Catching a benign exception thats expected...'
  
          for collection in all_c:
              self.database.drop_collection(collection)