Update dependencies.
Update README.md

Fix README typo.
Merge branch 'master' into dev
Added some tests about timestamp handling in item and collection creation. Fixed a timestamp/string discrepency in how these were handled in item and collection. Cleaned up the tests checks namespace and added missing namespace doc strings.
Remove clj-ns-browser due to hiccup issue: https://github.com/weavejester/hiccup/issues/100