allow for users to the command line tools without having a database

[alpiazza13]

Then they'd just get the JSON output. As of now it'll throw an error if there's no database set up. Probably want this to be a command line option similar to --showbrowser. Update the readme as appropriate after doing this. May only apply to parse_filings, parse_hearings, and parse_settings (not sure it makes sense to run the schedule without a database since that doesn't output any json files, and same with get_filings_settings_since_date, although a future issue could be to make them do that).

[mscarey]

I added --db / --no-db flags to the parse_hearings and parse_settings command line interfaces. These still need testing, and there are other command line interfaces in the repo. It would help to know if all the CLIs are needed by the users, or if there are some that can be cut.