Added load_users
Refactoring of load_users
Update validate_format
Refactoring config_spec.rb
Refactoring rspec tests using appropriate grammar
Refactoring of common verification
Fixed in the correct column name
Fixed bug . And changed name of method.
Add a test for verify the expected value
Merge pull request #1 from RustyNail/feature/TM-1

Feature/tm 1

Twimock::Config.load_users 実装ありがとうございます！
developに取り込みます。