West Bucktown is taking its own sweet time gentrifying, but within the past month, two new bakeries have opened on the same block (2200 W. North Ave.).‚  One of them is the Oak Mill Bakery, which features European pastries, tortes and cakes, but with a emphasis on Polish sweets; the other is Bake - a concept from a husband-and-wife team, both of whom are pastry chefs.‚  I spoke with Jennifer Kane about her new, sweet venture. Bake