Michigan's community colleges would be allowed to offer bachelor's degrees in nursing, wastewater treatment technology, allied health, ski area management, information technology and manufacturing technology, under legislation proposed in Lansing.  House Republican Mike Shirkey of Clarcklake is sponsoring the measure which would expand the variety of four-year degrees a community college could offer.  The legislation adds to bills passed during last year's Lame Duck, which allowed community colleges to offer four-year degrees in cement technology, maritime technology, energy production technology and culinary arts.  Shirkey says his proposal would give students more options on where they can earn four-year degrees.  But opponents argue that universities were already collaborating with community colleges in those areas.