#29 Add Cumulative Controller
#29 CumulativeWorker for collect board snapshots.
Temporarily add highcharts
#29 Graph partial with draft data
Cleanup code
Cleanup code
#29 Fix update_data and show graph.
Fix spec
Cleanup code
Todo comment
Merge pull request #33 from agileseason/feature/cumulative_flow_diagrams

Feature/cumulative flow diagrams