Add .idea dir to gitignore
Adjust directory structure
Add Liquid namespace
Update LICENSE
Code style
composer.json file
PSR-4 dir structure
Move constants to Liquid class
Rename exception file
Update PHPDoc, code style, set todos
Remove passing params by reference
Load tags with namespaces
Fix deprecated preg_replace call
Fix tag search path
Detect class name with reflection
Pass tokens as reference
Avoid strict standards errors
Remove several todos
FileSystem interface
Drop todos