Typography refactor & pagination tweaks

This PR bundles a few changes at once.

**The gist of it:** we won't have to specify the colour c-neutral1 and a default font-size on all of our components anymore. Yey: they now are the default.

There should be no visual changes, aside from pagination tweaks.

### All changes:
- remove `c-body`, set default body colour as `$c-neutral-1`.
- Remove instances where `color: $c-neutral1` is redundant
- typography is now always 16px/24px across all screen sizes. So this is not set at a global level (on body) instead of setting it on `.content` and `.from-content-api`
- same antialias on all the typography (as seen with Chris P) — guss will be updated soon to reflect this change
- pagination UX: states (clickable/not-clickable, current page) are more obvious (design approved by @vilderness) — it's relying on the new default body colour so I bundled this change directly in that PR
- made content css mobile first

## Pagination: before

![before](https://cloud.githubusercontent.com/assets/85783/3133642/7e5a057e-e81c-11e3-8106-a7ebfea5188d.PNG)


## Pagination: after

![after](https://cloud.githubusercontent.com/assets/85783/3133644/81df5e74-e81c-11e3-98d1-2724faea68df.PNG)

![ ](http://gifs.joelglovier.com/silly-animals/gear-up.gif)