Spoonbill theme version 1

# First version of the spoonbill theme.

## Layout
The spoonbill theme uses a flexible layout with a max-width for content. The header is fixed at the top of the page, with links to pages. The footer consists of big profile logos.
The homepage (`index.html`) lists all articles, with date and summary. The same style is used for other index pages: category, tag, author and archives. Pagination navigation is available if necessary.
Posts (`article.html`) have date and tags under title. Pages are styled similarly.

## Style
The spoonbill theme is minimalistic, with a white background and blue links. The text is big and has a decent line-height. Links use a dashed border-bottom for hover and some specific links are styled with an icon (e.g. GitHub and Picasa).
The theme uses the Google fonts `Open Sans` for body text and `Quicksand` for titles. `Font Awesome` is used to add icons.

## Reusability
All specific content (title, profile links, etc.) is coming from the Pelican settings file. The theme works without Google fonts or `Font Awesome` and looks even ok without CSS.

## Todo

* Test in other browsers than Chrome
* Style specific content (`code`, `pre`, `img`, etc.)
* Remove unused Javascript
* Make mobile-friendly