Fix generating template name in createTemplate() method
Fix generating template name in createTemplate() method

Before this change the name for the template was generated randomly based on uniqid(mt_rand()). It generated new file whenever the  template was loaded as string using the `template_from_string`  even the template was the same. The generated file wasn't used anymore.
Now the cache file is generated by the content of template so using the `template_from_string` is faster and doesn't pollute the cache folder with unneeded files.
twigphp/Twig,twigphp/Twig,nicolas-grekas/Twig,gencer/Twig,gencer/Twig,nicolas-grekas/Twig,nicolas-grekas/Twig,nicolas-grekas/Twig,twigphp/Twig,nicolas-grekas/Twig