Fix resize tool for ios6
Fix resize tool for ios6

Igor-Palaguta/CLImageEditor,yackle/CLImageEditor,ChronicStim/CLImageEditor,shenyuan000/CLImageEditor,CatPolice/CLImageEditor,sekouperry/CLImageEditor,mkernahan/CLImageEditor,ycaihua/CLImageEditor,yangxt/CLImageEditor,nagyistoce/CLImageEditor,Mioke/CLImageEditor,zuoguoqing/CLImageEditor,ShengQiangLiu/CLImageEditor,Pole-he/CLImageEditor,DavidWangTM/CLImageEditor,pitatensai/CLImageEditor