G-Cloud division of procurement

Pivotal: https://www.pivotaltracker.com/s/projects/911874/stories/62377720

Please note: 

1) The Backdrop stubs are not yet showing real count data or cumulative data (as shown by the design) because these don't yet exist in Backdrop. I will update the Backdrop and Stagecraft stubs when Backdrop has been amended to support these queries. 
2) There is a stubbed "total" line on the graph and "total" series in the Backdrop stub: we may need to amend Spotlight to handle this as a separate API call in the future.