[extractor] removed the import for Autocorrelation (not existing anymore)

bob/pad/face/extractor/__init__.py

@@ -10,7 +10,6 @@ from .FreqFeatures import FreqFeatures
 from .NormalizeLength import NormalizeLength
 from .FFTFeatures import FFTFeatures 
 from .LTSS import LTSS 
-from .Autocorrelation import Autocorrelation 
 
 def __appropriate__(*args):
     """Says object was actually declared here, and not in the import module.