Remove Gemfile.lock

A rubygem usually does not include Gemfile.lock in a repository.
Remove duplicate dependency of i18n
gemfile.lockファイルを除外した。

Conflicts:
	.gitignore
	gemfiles/3.2.gemfile.lock
	gemfiles/4.0.gemfile.lock
	gemfiles/4.1.gemfile.lock
Merge pull request #5 from tkawa/fix-dependency

gemの依存関係の修正