Support for visual and SEO elements on fronts

Making fronts meta data richer by adding support for visual and SEO elements.
This changes facia-tool only.

### Before
![screen shot 2014-09-08 at 17 10 06](https://cloud.githubusercontent.com/assets/1492162/4188473/d486b974-3772-11e4-926b-dad7fe86dea9.png)

### After
![screen shot 2014-09-08 at 17 10 48](https://cloud.githubusercontent.com/assets/1492162/4188472/d43724ea-3772-11e4-8375-f570d69e6a89.png)

    SanitizeInput.fromConfigSeo(config).fronts("uk") should be("now")