Create a settings file with API hostnames

[unsystemizer]

It seems it'd be useful to replace hard-coded hostames with variables and have host settings stored in a separate settings file. Then users could set servers they want to use in one place.

[ScroogeMcDuckButWithBitcoin]

As is those attributes are pretty easy to change after the connection has been initialized as the variables which store those settings are in read/write variables on the connection object. Nonetheless, I do envision adding a parameter to the intialization options sooner than later to accomodate this goal