Rename QuestionChartWidget to TermCountChartWidget as this is what it does, and pull the actual data from the transport layer.

Now raises TransportException if taxonomy does not exist

Now checks if taxonomy exists

Ensure dashboard displays error in case of missing or faulty widget, rather than causing the whole application to fail.

In order to support the next test, which will use a slug of a
taxonomy that doesn't exist

Names are now tested elsewhere

Changed name from default 'pk' to 'slug' as that is what we are passing in to the API.

Changed the factories not to create objects if they already exist.
Also renamed various test data to have names that don't conflict with
the fixtures,

Fix previous merge: use the version of get_category_options that came from the taxonomies branch, not the staging branch.

Conflicts:
	django/website/hid/views.py
	readme.markdown

Conflicts:
	django/website/media/css/styles.css
	django/website/media/less/view-edit.less

Still hard coded
https://trello.com/c/GSjVYcNz/76-change-hardcoded-drop-down-elements-on-staging