PHP->Vignette Interface

@Wikia/platform-team @garthwebb  
https://wikia-inc.atlassian.net/browse/PLATFORM-389
related to https://github.com/Wikia/config/pull/616

This is dependent on standing up an instance of the new thumbnailer somewhere in dev, and then setting the ```$wgVignetteUrl``` setting in the config. This is the next thing I'll be working on.