add sonar analytics
add more log method overload in interface Logger
add print thread name support for class SimpleLogger
Externalize class LoggerConfig and add getters/setters
add more javadoc for interface Logger
add method finalTag for class Utils
refactory: add class PropertyConfigurator to parse config file
set all classes modifier to 'default' except Logger and LoggerFactory
add configure 'debug', it's the switch of zlog internal logging
finish the refactory of class LoggerFactory
fix a bug that log tag is empty when setting show thread name
change version to 0.2.0-RELEASE