added smarty plugin to extra folder
removed cache_file_mode
Update composer.json
Update README.markdown
Merge branch 'master' of git.gree-dev.net:wgs1taskforce/handlebars.php into php-52

Conflicts:
	composer.json
moved code block into _variable functions
Merge branch 'php-52' of https://github.com/yuta1228/handlebars.php into php-52
enabled caching