Merge pull request #74 from robotmay/master

Remove identity_cache due to Rails 4 issues and bugs
Add GH repo link to footer
Tidying up the application layout and making analytics JS optional
Merge pull request #79 from robotmay/github-footer-link

Add GitHub link to footer
Update the README with a few notes on production.

[ci skip]
Merge pull request #80 from robotmay/layout-tidy

Tidying up the layout file
Make a note of memcached being required for sessions in development
Update instructions for S3 in dev
Merge pull request #85 from robotmay/s3-region-fix

Use S3 region from env file
Merge pull request #86 from robotmay/s3-readme-update

Update instructions for S3 in dev
Add locale support to URLs
Move about page into locales and add other missing keys
Default collections should be translated
Add I18n support to category names
Implement locale support through URLs
Enable language switching around the site
Bugfix for controller testing on travis
Merge pull request #88 from robotmay/user-language-selection

User language selection
Add Dutch language support
Add Polish language support