Style dashboard

1. Add instance summary.  This lists the number of instances and how many are in each state (active, building, shutoff, etc.)

2. Add volume summary.  This lists the number of volumes and how many are in each state (available, attached, etc.)

3. Add provider summary.  This lists each provider, along with the number of instances, cpu current/max, memory current/max, number of volumes, storage current/max, and storage count current/max.

4. Added ability fetch maintenance notifications and display them.

5. Now showing instance launch history on the dashboard.