setting dimension in backend to fix issues with cache not clearing caused by previous commits:
- https://github.com/HollerLondon/sfCmsPlugin/commit/122e7a4241a690f5941a9be233e1f4b59f180e9c
- https://github.com/HollerLondon/sfCmsPlugin/commit/7282809b14a890a145cab5a6d6f772eaa155f722
- https://github.com/HollerLondon/sfCmsPlugin/commit/122e7a4241a690f5941a9be233e1f4b59f180e9c