Counter based OTP added, removed UsedCodesManager from authenticator, UsedCodesManager refactoring
GenerateKey now static, Update README.md
Typo
Interface for UsedCodesManager
Methods for synchronization
use unsigned long as counter
Always use UsedCodeManager
Use one global default UsedCodesManager
Merge branch 'master' of https://github.com/dusk0r/TwoStepsAuthenticator
Documentation update
Code review