Implement initial stats for ingest/archive based on facets.

Visualise facets via d3 lib.
Ingest > preview package

Add basic package preview in Ingest
Implement clock in worldclock using d3.

Generate the worldclock via d3 plus clean up the implementation.

SDUX-62
Completed basic functionality.

SDUX-74
Actual functionality completed.

SDUX-74
Ingest widget styling fix

Add some styling to items list
Add some styling to config popup
Tidied after template rewrite.

SDUX-74
Cleaned up ingest widget, tidied configuration.

SDUX-74
Moved ingest widget into superdesk-items.

SDUX-74
Merge remote-tracking branch 'ozan/ingest-widget'
Remove extra form label in ingest widget config.