Add Yubikey Neo Manager v0.2.2

https://www.yubico.com/2014/04/yubikey-neo-manager-application/

[Google recently announced](http://googleonlinesecurity.blogspot.co.uk/2014/10/strengthening-2-step-verification-with.html) support for U2F keys and Yubikey is one of those, but it needs be configured for U2F using this manager.