Switch to namespaced Twig classes

[mynameisbogdan]

Hello,

I think it's due switching to Twig's namespaced classes in order to support next versions of Twig/Symfony.

https://symfony.com/blog/new-in-twig-namespaced-classes

[sampart]

Hi @mynameisbogdan, thanks for contributing!

Please could you check which versions of Twig/Symfony are required for this to work and include any necessary changes to composer.json in this PR (or confirm that this code will work with all the versions matching the rules in composer.json). Thanks!

[mynameisbogdan]

Hello @sampart!

I just bumped the PHP minimum version to 5.3.3, and also for Twig to 1.34 which is the first release to introduce namespaces.

Also, travis builds for this repo doesn't seem to works?

[sampart]

Thanks for this, @mynameisbogdan, that's great. I've merged it now, and created a release.

Yes, you're right about Travis. However, as this project is not actively maintained, that's unlikely to change, I'm afraid. (Would you be interested in creating a fork as described in that issue?)