title: Data must be 1 dimensional when converting dictionary to dataframe
body: <p>I have a input of dictionary like this -</p>
  
  <pre><code>import pandas as p , numpy as n
  dict={
  's1':n.array([[1,2],[3,4]]),
  's2':n.array([[5,6],[7,8]])
  }
  print(p.DataFrame(dict,index=[0]))
  </code></pre>
  
  <p>Expeced o/p</p>
  
  <pre><code>                     s1           s2
          0         [1,2]          [5,6]
          1         [3,4]          [7,8]
  </code></pre>
  
  <p>I'm getting an exception :data must be 1 dimensional , but when I pass 2d list in value I get the expected o/p. How to prevent this exception ??</p>