override column names read_excel

>>> names = [20140109, 20140213, 20140313, 20140410, 20140508, 20140612, 20140714]
>>> df = pd.read_excel("out.xlsx", header=None, names=names)
>>> df
   20140109  20140213  20140313  20140410  20140508  20140612  20140714
0  0.619159  0.264191  0.438849  0.465287  0.445819  0.412582  0.397366
1  0.601379  0.303953  0.457524  0.432335  0.415333  0.382093  0.382361
2  0.579914  0.343715  0.418294  0.401129  0.385508  0.355392  0.355123