Added new projectaccounting query to get project's single bucket usage rollup.
Added new service method to call new query.
Added implementation for IsAuthenticated method which is used by new generated API.
Change-Id: I7cde5656d489953b6c7d109f236362eb465fa64a
Finished implementing queries for both bandwidth and storage using pgx.Batch.
Fixed CSP styling issue.
Change-Id: I5f9e10abe8096be3115b4e1f6ed3b13f1e7232df