BUG: GH11517 add multiindex column names after describe()
Hi,

This fixes the bug mentioned in https://github.com/pydata/pandas/issues/11517
I have added column names after the describe operation. 
Request you to review the change and merge it. 

Thanks 

Please add a test for this :)
 Hi,

I have added test case for that . 
Request you to review the change . 
 pls add a whatsnew note for 0.17.1
 Thanks for comments.
I have modified test case and also added comment to whatsnew 0.17.1
Please review.. 
 couple of comments. pls squash when done. ping on green.
 I have made the changes. 
Request you to please review and merge. 
 looks good. pls squash to a single commit. ping when green.
 Done. Please check.
 pls squash: http://pandas-docs.github.io/pandas-docs-travis/contributing.html#combining-commits
 Apologies for not getting it right the first time
Please check.
 thank you sir!
 @varun-kr @jreback 

Thanks for fixing this bug. :+1:  I'll have to get on the bandwagon and submit some pull requests also.
