DISP: show column dtype in DataFrame.info() output
closes #3429.

Old:

```
In [39]: DataFrame(randn(10,2)).info()
<class 'pandas.core.frame.DataFrame'>
Int64Index: 10 entries, 0 to 9
Data columns (total 2 columns):
0    10  non-null values
1    10  non-null values
dtypes: float64(2)
```

New:

```
In [39]: DataFrame(randn(10,2)).info()
<class 'pandas.core.frame.DataFrame'>
Int64Index: 10 entries, 0 to 9
Data columns (total 2 columns):
0    10 non-null float64
1    10 non-null object
dtypes: float64(1), object(1)
```

:+1: 
 @cpcloud can you put an example of old and new up in the descr...
 sure thing
 @y-p @jreback merge on passing?
 I think their is an issue about adding the info method to Series, so maybe make a quick test method that assets that it raises (and ref this issue) - because series doesn't have a dtypes method (and this needs a modification for this change)
 ok
 0.14 starts next week, honor the bug-fix only period?
 @y-p ahh yes... sorry. merge after 0.13 rls
 It's clear nothing could possibly go wrong with something as simple as this. We've been there before... :)
 @jreback 

> and this needs a modification for this change

not sure what u mean
 what I mean is that the implementation would break for an info method on series (which doesn't exists at the moment)

so I think that you should have a test of this method that assert raises with a series for attribute error
 Yep ok that's what I thought. Test is there.

On Sunday, December 15, 2013, jreback wrote:

> what I mean is that the implementation would break for an info method on
> series (which doesn't exists at the moment)
> 
> so I think that you should have a test of this method that assert raises
> with a series for attribute error
> 
> —
> Reply to this email directly or view it on GitHubhttps://github.com/pydata/pandas/pull/5682#issuecomment-30606978
> .

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Best,
Phillip Cloud
 @jreback , can I merge this or is it pending #5167?
 i think this is fine
 Thanks @cpcloud. You used to be a code fountain not that long ago, did RL catch up with you? :)

will add release notes.
 Got a job where I don't use Python. Had to put my pandas love on the back burner while I refamiliarize myself with C++ and learn a bunch of windows OS material. Not a whole lot of time on Linux. It brings me to tears occasionally. I'll try to at least bring it to a trickle in the coming months. 
 please. trickle. :)
 if you're in microsoft land, LINQ and Rx are quite beautiful...
 I can add those release notes tomorrow if you don't beat me to it. Otherwise, much appreciated. 
 Done 10 minutes ago, don't worry about it.
