Documentation example for pd.read_msgpack throws exception
The code example in the documentation for [read_msgpack](http://pandas.pydata.org/pandas-docs/stable/io.html#msgpack) throws a SyntaxError due to Python 2 syntax for printing:

```
In [319]: for o in pd.read_msgpack('foo.msg',iterator=True):
   .....:     print o
   .....: 
  File "<ipython-input-319-a0f40395739e>", line 2
    print o
          ^
SyntaxError: Missing parentheses in call to 'print'
```

This should be a simple fix but maybe someone can also search through the docs for other examples of the same problem.