Additional Big Bang Integration

Related to #3 (closed)

Closes #1 (closed)

Added

• Grafana dashboard
• Overview document

Changed

• Updated Helm chart to 2.1.3 from upstream
• Replaced PodMonitor with ServiceMonitor
• Updated test resources to latest images (gluon, kubectl)
• Split test resources into one resource per file
• Updated labels and annotations on test resources to fix upgrade issue
• Added timeout to scripted Helm test