New container no images test

# What?
We're removing the images from stories that of `standard` volume in the news container.

# Why?
We are testing to see if the news stories will be more easily scanable / digestable.
Another interesting point will be to see whether it puts more emphasis on the bigger stories.

# What we're expecting
Either the standard images will be read more, or the bigger stories read more.
If it is more digestable, we expect users to spend less time on page, but return more often.

# Opt in/out
[Opt in (Live)](http://www.theguardian.com/uk#ab-NewsContainerNoImages=no-images-standard)
[Opt out (Live)](http://www.theguardian.com/uk#ab-NewsContainerNoImages=nointerest)
[Opt in (Preview)](http://preview.gutools.co.uk/uk#ab-NewsContainerNoImages=no-images-standard)
[Opt out (Preview)](http://preview.gutools.co.uk/uk#ab-NewsContainerNoImages=nointerest)

# Can I see it?
### Before
![before](https://cloud.githubusercontent.com/assets/31692/3810528/43064470-1c91-11e4-9ca1-fd8afb15f245.png)

### After
![after](https://cloud.githubusercontent.com/assets/31692/3810527/43025054-1c91-11e4-832a-0750a07f60e1.png)

---

![No pictures please](http://i.perezhilton.com/wp-content/uploads/2013/09/original(2).gif)
In the news container - these are always held within the `item__media-wrapper`.