Fix device api date encoding.

Cheshire beats data.json again.
Merge pull request #154 from MastodonC/feature/fix-device-api

Fix device api date encoding.
Fix render-item multimethod predicate.

And the changes that needed to happen in the rest of the API.
Merge pull request #156 from MastodonC/feature/fix-render-item

Fix render-item multimethod predicate.
Search UI

- Add routes and html.
- Reuse property_details tab for search tab.
- Add multimethod for parsing timestamps.
Tidied up as per PR comments.
Merge pull request #149 from MastodonC/feature/property-search-ui

Property search UI
Added simple edn tests.
Merge branch 'feature/http-edn-testing' of https://github.com/MastodonC/kixi.hecuba into feature/http-edn-testing