DataFrame constructor fails on list of tuples
In [93]: pandas.**version**
Out[0]: '0.5.0'

In [94]: df = pandas.DataFrame({'A': [(1, 2)]})

---

AssertionError                            Traceback (most recent call last)

< .. snip ... >

The latter fails, however the following works fine:

In [95]: s = pandas.Series([(1, 2)])         ---> this was fixed in issue #270

In [96]: df = pandas.DataFrame({'A': s})

In [97]: s
Out[0]:
0    (1, 2)
Name: None, Length: 1

In [98]: df
Out[0]:
     A
0  (1, 2)
