@Slf4j toUpperCase fix

Hi,

Logging annotations produce wrong method name for "info" keyword since in Turkish locale uppercase form of "i" is "İ". Please see below link for details.

http://java.sys-con.com/node/46241

Sample error message from usage :
	groovy.lang.MissingMethodException: No signature of method: ch.qos.logback.classic.Logger.isİnfoEnabled() is applicable for argument types: () values: [] Possible solutions: isInfoEnabled(), isInfoEnabled(org.slf4j.Marker), isErrorEnabled(), isWarnEnabled(), isErrorEnabled(org.slf4j.Marker), isWarnEnabled(org.slf4j.Marker)

Regards
Hakan Baykuşlar