yaml

This changes the format of the required configuration file to yaml, to stay in line with the other conf files. The data inside is the same, but in yaml.
I am going to be nit-picking here: the value 'localhost' is not a URL, it is a domain name. Python urlparse uses the term 'netloc' for domain name+port. A proper URL must also include the scheme (http: or https:).

My advice: call it BASE_URL (or similar), which in this case has the value **http://localhost:5984/**, which the code then parses into port number, domain name, and scheme, as needed.