Merge pull request #26 from alphagov/bugfix-json-client

Update JSON client
Add setup instructions to README
Karma config / plugins / autowatch
Slides refactor
- use singleton not class for renderer
- externalise markup as Mustache templates
- use latest client / getDashboardMetrics method
- Split slide CSS into separate SASS file
- Add BRFS support
Update client to include new formatted keys. Transform data to use new structure and conditionally show change %
Add trend colours

Slide styles
If 2 most recent figures aren't available, don't show the slide