geekscrapy

# fields		=	ordered list of sorting fields
# obs			=	an iterator of objects where fields are present (fields MUST exist)
# order_desc	=	Sort descending(false)
# ignore_case	=	put field vales to lowercase, generates less overlap
# top_count		=	return the top X
def histo(fields, obs, order_desc=True, ignore_case=False, top_count=None):

	master = []