Add Fixtures
Add plugins directory to gitignore
Add autoloader.php and services.php
Add base plugin files
Add plugin add and remove commands
Update autoloader path
Add dependencies for plugins
Add temporary filesystem service provider
Register temporary filesystem and plugin service providers
Add plugin commands unit tests
Fix unit tests
Update CHANGELOG
Address github comments
Merge pull request #368 from romainneutron/plugins

[3.8] Welcome Plugins