SVG icons for splash pages - NOT FOR MERGING

_**NOT FOR MERGING**_

Idea for dealing with SVGs in new splash-pages, specifically with the fluorescent shadow style in mind.

- `<path>` elements stored in an include eg `_enterprise_icon.html`
- CSS component (stored in `/figures`) added to set icon dimensons eg `.enterprise-icon`
- easy building inline with fill utilities eg `u-fill-yellow`
- make components for styling in context eg `.svg-icon-shadow` used to transform one of the included set of paths

```
<svg class="enterprise-icon" viewbox="0 0 457 457">
  <g class="svg-icon-shadow u-fill-yellow">{% include "svg/_enterprise_icon.html" %}</g>
  <g class="u-fill-dark-gray">{% include "svg/_enterprise_icon.html" %}</g>
</svg>
```

Might be a bit crazy but was imagining easiest way to use these icons in a way that makes them easy to include, build & maintain (changing sizes, path colours, transformations) and also easy to see what's happening in the code.

![screen shot 2014-09-17 at 16 43 44](https://cloud.githubusercontent.com/assets/883598/4306489/77d7897c-3e81-11e4-9dd1-384d812c7254.png)