Refactor .card--page

Opening early so there's visibility because it affects a few apps...

- Refactors `.card--page`component and structure, removes specific layout styles
- Moves 'booking panel', TTD detail, lodging detail and 'stack article' styles to Waldorf
- Removes styles from `.stack__intro`, stacks should be structural only
- Removes POI pins sprite map (not related, but unused)
- Removes 'visual breadcrumbs' because they're not at all useful and get in the way

## PRs for apps

- https://github.com/lonelyplanet/waldorf/pull/1299
- https://github.com/lonelyplanet/community/pull/1693

## Screens

### Stack headings
![screen shot 2014-07-01 at 12 18 36](https://cloud.githubusercontent.com/assets/271645/3442257/d4a78fec-0111-11e4-837b-e1f90067eef1.png)
![screen shot 2014-07-01 at 17 38 24](https://cloud.githubusercontent.com/assets/271645/3446128/2e410976-013e-11e4-8187-f68b44e0724a.png)
![screen shot 2014-07-01 at 17 51 10](https://cloud.githubusercontent.com/assets/271645/3446290/f54c4c82-013f-11e4-8540-cef809d7a5e9.png)
![screen shot 2014-07-01 at 12 19 46](https://cloud.githubusercontent.com/assets/271645/3442255/d4a68a8e-0111-11e4-93e4-7031da5f17b6.png)
![screen shot 2014-07-01 at 12 20 35](https://cloud.githubusercontent.com/assets/271645/3442256/d4a735f6-0111-11e4-8499-0e606eb8fbed.png)

### Articles
![screen shot 2014-07-01 at 15 56 09](https://cloud.githubusercontent.com/assets/271645/3444628/e2a2ce68-012f-11e4-8719-1c018db8cf53.png)
![screen shot 2014-07-01 at 15 55 46](https://cloud.githubusercontent.com/assets/271645/3444627/e293acee-012f-11e4-8a09-56ccc4a2a67a.png)

### TTD details
![screen shot 2014-07-02 at 11 19 34](https://cloud.githubusercontent.com/assets/271645/3454522/9a78c892-01d2-11e4-95ca-e30a044053ad.png)
![screen shot 2014-07-02 at 11 19 57](https://cloud.githubusercontent.com/assets/271645/3454523/9a7a61f2-01d2-11e4-9d54-e0aa3c323ec8.png)
![screen shot 2014-07-02 at 11 20 14](https://cloud.githubusercontent.com/assets/271645/3454524/9a7add8a-01d2-11e4-8395-e3204faa6015.png)
![screen shot 2014-07-02 at 11 20 30](https://cloud.githubusercontent.com/assets/271645/3454525/9a7b81e0-01d2-11e4-8d52-95bd7e2c4d47.png)
![screen shot 2014-07-02 at 11 21 01](https://cloud.githubusercontent.com/assets/271645/3454526/9a7c16c8-01d2-11e4-9ed4-276c0ee84848.png)

### Lodging details
![screen shot 2014-07-02 at 16 19 48](https://cloud.githubusercontent.com/assets/271645/3457868/5f5f6d7c-01fc-11e4-8e4c-730f34077102.png)

I don't have a problem with the high contrast vars, they're used for the filter dropdowns and things too which require the same treatment. Is it a lack of flexibility you're thinking about?