Exposition 0.2 First public release.

- Visible end user changes:
Added loading feedback with [spin.js](http://fgnass.github.com/spin.js/).
Added individual URLs for photo and album items using HTML5 History API.
Stopped using webkit brightness filter for thumbnail hover state.
Made sure only the thumbnail image is clickable in album view.
Added prefetching of next/previous photo in photo view.

-Internal robustness changes:
RESTFul API with HTTP Image Caching support. This requires Apache mod_rewrite.
Prevented scaling up of small images in photo view.
Added error handling support (fatal errors, album thumbnails, photos, noscript).

Merge branch 'develop'
Fixed typo in changelog.md