Bump classifier version to 1.4.4 and improve LSI content node scaling

- Update classifier version from 1.4.3 to 1.4.4 in Gemfile.lock and gemspec
- Enhance LSI content node scaling by considering unique words count
- Add test case for classifying repeated words in LSI

Release version 1.4.3

Version 1.4.2

Version 1.4.1

Version 1.4.0