The project itself is the only thing that uses the NS prefix. The classes within the project have the (rather long and safe) prefix of "Logger".
If you're writing a library, you really need to prefix absolutely every last stupid symbol, right down to the header include guards. If you don't, even if they don't end up conflicting with something, you'll have people like me moaning about it. (But I don't moan about it because it's never caused me a problem in the past.)
Looks like a neat library though!