Issue title: CDEC historical data does not retrieve today's data for hourly data
 Issue body: This is due to the _download_raw only using the date and not the full datetime with hours and minutes in the url.  I'm working on a solution now. 
 Comments: 
 Comment 0: Nice to see some interest in this. 
{'source': 'GithubIssues', 'repo_name_with_owner': 'ulmo-dev/ulmo', 'issue_id': 188131327, 'repo_stars': 160.0}