docs: def remove_sample(self, md5):
          """Delete a specific sample"""
  
          # Grab the sample
          record = self.database[self.sample_collection].find_one({'md5': md5})
          if not record:
              return
  
          # Delete it
          print 'Deleting sample: %s (%.2f MB)...' % (record['md5'], record['length']/1024.0/1024.0)
          self.database[self.sample_collection].remove({'md5': record['md5']})
          self.gridfs_handle.delete(record['__grid_fs'])
  
          # Print info
          print 'Sample Storage: %.2f out of %.2f MB' % (self.sample_storage_size(), self.samples_cap)