[noticket] Convert list of themes to JSON
[noticket] Script to fix existing secondary themes
[noticket] Don't json.loads when loading data because it might not be json
[noticket] Cater for either a list or a string
[noticket] Change fixing script to JSONify strings as well
[noticket] Wrap json.dumps in case data isn't coming from the form
Merge pull request #71 from datagovuk/fix-secondary-themes

Fix secondary themes