Remove the parameter of App::user
Add master config file verification
Merge pull request #37 from sowa-snow/feature/config_validation

Add the master config file verification
Merge pull request #40 from sowa-snow/workings/user

Remove the parameter of App::user
Remove [] operator override of Pathname class
Merge pull request #41 from sowa-snow/workings/filepath

Remove [] operator override of the Pathname class
Refactoring app.rb