issue #251

https://github.com/cpfl300/2014_HARU/issues/251

statusDao 및 status table 설계
issue #252

https://github.com/cpfl300/2014_HARU/issues/252

getLastStatus() 구현
issue #253

https://github.com/cpfl300/2014_HARU/issues/253

StatusDao.getLast() 구현
issue #254

https://github.com/cpfl300/2014_HARU/issues/254

status.next() 구현