Auto-refreshing latest block on live blog cards on fronts

Woop de doo!

![screen shot 2014-10-15 at 13 11 18](https://cloud.githubusercontent.com/assets/1001642/4645099/85e1e4ce-5464-11e4-9efe-ce0ca3f446e2.png)

`common/utils/template` makes this string replacement easier

can also moved this html into an external file using the `text!` plugin (easier to read than JS strings)

e.g. https://github.com/guardian/frontend/blob/master/static/src/javascripts/projects/common/modules/commercial/badges.js#L30