[304] Remove minornavigation elements from ga-report extension.
[304] Restyled sidebar
[304] No need to declare a content_class any longer.
[304] Don't show No Graph Loaded text on Publishers page.
[304] most_popular_datasets can render a preview image
[403] Rickshaw graph always renders all series, no matter which month is selected.
[403] Fix rickshaw choking if there is an empty 'Others' series.
Merge branch 'stable' of github.com:datagovuk/ckanext-ga-report