#2 add refresh countdown display to ShowRegionView.
#2 add Autorefresh of Region-Graph every 60 seconds, Compactions still missing.
Compaction Metrics are now also refreshed.
Refactoring: add MetricsSeries model which acts as Adapter for Rickshaw and the Backbone.js model
#2 enable auto-refresh of tables
#2 enable autorefresh of cluster
Merge branch 'topic/auto-refresh'. Closes #2