Fix deprecation warning when running the tests

Watir now has a textarea field which is supposed to be used when you are
dealing with a text area rather than a text field.
Use pluralised properties in the API metadata

This is to be consistent with the urls that they refer to, which are
pluralised. It should also make popit-python work properly again.

I haven't changed the image_proxy_url property as that path isn't
currently pluralised.
rebuild npm-shrinkwrap.json
deploy to production - version bump to 0.0.29
Merge branch 'master' into production