Apply new visual tonal colours to article meta data

This applies the new visual tonal colours of news, comment and features to all article and article meta data. Colour values and tone groupings are subject to change.

#### Before
![Before](http://cl.ly/image/3M2a0G181N2X/Image%202013.09.26%2015%3A14%3A30.png)

#### After
![After](http://cl.ly/image/2M0s081s3d2F/Image%202013.09.26%2015%3A15%3A12.png)