[config][s]: support for non-CSV google spreadsheet urls in config plus default places.
[util][xs]: temporarily comment out calculation of reviewer and submitter lists.
[model][xs]: better debugging info on load.
[config][xs]: load site_url from environment.
[routes][xs]: rstrip trailing slash from site url when setting up auth.
[refactor][xs]: do not restrict no of datasets to 10.

* Instead allow for as many datasets as are in datasets spreadsheet.