TST: Encode minutes in continuous future tests.
TST: Encode minutes in continuous future tests.

Include minutes (in addition to the days) in the price encoding for
continuous futures tests.

Need for different values minute to minute arose when working on tests
for adjusted values.

quantopian/zipline,bartosh/zipline,Scapogo/zipline,quantopian/zipline,bartosh/zipline,humdings/zipline,Scapogo/zipline,enigmampc/catalyst,florentchandelier/zipline,humdings/zipline,enigmampc/catalyst,alphaBenj/zipline,florentchandelier/zipline,alphaBenj/zipline