Image gallery update and non-footer breadcrumb component

Related Waldorf PR: https://github.com/lonelyplanet/waldorf/pull/1483

Breadcrumb styleguide page:
![breadcrumbs](https://cloud.githubusercontent.com/assets/708296/4320790/81eb770c-3f3a-11e4-8e34-1b3923a7a0b7.png)

Image gallery:
![image-gallery](https://cloud.githubusercontent.com/assets/708296/4320963/f925d064-3f3b-11e4-854e-07e6679eecd7.png)


`10px` was just way too small... it would trigger when just trying to scroll down the page naturally. I found `100px` to be a good threshold for what feels like an objective swipe.