Remove require_relative. rewrite to require
Merge remote-tracking branch 'github/master' into refactor_and_fixes
Add add_targets method
Update adding target method
Call target excludion method in initialize
Modifiy data saving key name

remove first slash character
it will take effect to avoid that to create empty named directory
Merge pull request #4 from gouf/refactor_and_fixes

Refactor and fixes