Added methods Debugf(), Warningf(), etc, which are aliases to DebugF(), WarningF(), etc
Added methods Debugf(), Warningf(), etc, which are aliases to DebugF(), WarningF(), etc

- Implements of printf-like methods with 'f' sfx now aren't aliases to methods with 'F' sfx. (cause otherwise caller stack and filename will be incorrect)

apsdehal/go-logger