Update CDO list

[lukefretwell]

Add:

Niall Brennan, CDO, Centers for Medicare and Medicaid Services
http://www.nextgov.com/big-data/2015/03/get-know-chief-data-officer-niall-brennan-cms/107748/

Brandon Pustejovsky, CDO, U.S. Agency for International Development
http://www.nextgov.com/big-data/2015/03/get-know-chief-data-officer-brandon-pustejovsky-usaid/107757/

Scott Shoup, CDO, Federal Emergency Management Agency
http://www.nextgov.com/big-data/2015/03/get-know-chief-data-officer-scott-shoup-fema/107760/

Ian Kalin, CDO, Commerce Department
http://www.nextgov.com/cio-briefing/wired-workplace/2015/03/commerce-department-joins-new-chief-data-officer-trend/107622/

[rebeccawilliams]

Note the pending: #451 -- I just added Brandon to that PR too, thanks!

Right now the list is the Department level. @gbinal, thoughts on how to showcase sub-departmental agency CDOs?

[gbinal]

@rebeccawilliams - I don't think there's any compelling reason to keep it at that level. It's helpful to highlight CDO's at agencies, too. I'd say that if it's on this list of federal agencies, it's worth being on our list

[rebeccawilliams]

Great, added the remainder in PR #460. Thanks @lukefretwell.