I think it may be http://Proxima Nova by Mark Simonson.

- Mike Yanega

There are some minute differences: amongst others the the downwards point of the "M" is sharper, the cross-bar on the "A" is higher, the cedilla is different, but it's almost identical.

If you need that atmosphere, that style, that look, get Proxima Nova. If you need an exact match, you'll have to look further.

Could be the previous version?
http://new.myfonts.com/fonts/marksimonson/proxima-sans/

By the way, that really seems just a "hand-made" cedilla.