Change DefaultDateTimeHumanizeStrategy to turn 60 min to one hour not 45

`DefaultDateTimeHumanizeStrategy` has an inconsistent behavior: it returns 59 seconds for 59 seconds but returns one hour for 45 minutes!! If someone wants 45 minutes to report an hour, they would most likely want 45 seconds to return a minute too, in which case they can use the `PrecisionDateTimeHumanizeStrategy` that does this.
