Rename to performance_dashboard

Fix totals to return totals for all time rather than for date range.
Added more test data

app/performance_dashboard/performance_dashboard_schema.py

@@ -0,0 +1,10 @@
+performance_dashboard_request = {
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "description": "Performance dashboard request schema",
+    "type": "object",
+    "title": "Performance dashboard request",
+    "properties": {
+        "start_date": {"type": ["string", "null"], "format": "date"},
+        "end_date": {"type": ["string", "null"], "format": "date"},
+    }
+}