And just like that, a new bakery has appeared in Santa Monica.   Modern Bread & Bagel has moved into the old Breadblok space at 1511A Montana Ave.   Modern Bread & Bagel currently has two locations in New York, and one in The Valley.   They specialize in breads and famous bagels that are organic and gluten-free, and also offer a menu of bagel sandwiches, salads, bowls, and breakfast items.