refactoring around main() function.
Fix a bug "from,to" parameter converting.
Refactor tigrep::Application::run() method.
refactoring around main() function.
Merge branch 'spike-log-type-refactor' of github.com:tri-star/tigrep into spike-log-type-refactor
Merge pull request #3 from tri-star/spike-log-type-refactor

refactoring around main() function.