Add Google Analytics code
Read settings from multiple files

All /config/*.settings.yml files are read.
Update gems
Revert to hardcoded values
Add sitemap (for search engines)
Only try to show images after they have been downloaded
Only try to show images if they have been dodwnloaded
Use Susy instead of semantic.js as Sass/CSS grid framework
Fix typo
Merge remote-tracking branch 'upstream/staging' into staging