Mortgage rates made small moves this morning, with 30-year fixed and 5/1 ARM rates ticking up a hair, and 15-year fixed rates holding steady for the third day in a row, according to a NerdWallet survey of mortgage rates published by national lenders on Wednesday. Mortgage Rates Today, Wednesday, Jan. 18 (Change from 1/17) 30-year fixed: 4.31% APR...