Refactoring Pluralize
Update tests
Make separate class - Pluralize

All features of Russian will be build as a separate class.
We can add a new class and extend Russian with extendBy function.
Set global plugin with Russian namespace
Add tests for created Pluralize
Describe Pluralize class and its methods
Pre-release Pluralize
Merge pull request #4 from EvgenyZhlobo/pluralize

Update Pluralize class