factor the class hierachy, seperate source code between Logger and Modifier
dead write logger
revise some variable name
Merge branch 'master' of https://github.com/august782/performance-testing-tools
change the WriteReadRatioLogger to the Dir Logger
Merge branch 'master' of https://github.com/august782/performance-testing-tools
Merge branch 'master' of https://github.com/august782/performance-testing-tools
Add JDBC Example and add functionality to ModifierMethodWriter to Project Tracking by Mengqi