Reconfiguring the subdomain does not work

[wsmoak]

If you configure the gem initially and then repeat the configuration block, such as:

Chargify.configure do |c|
  c.subdomain = ENV['CHARGIFY_OTHER_SUBDOMAIN']
  c.api_key   = ENV['CHARGIFY_API_KEY']
end

It does not work. Requests still go to the original subdomain.

Internally, the 'site' is cached from the original config, and must be cleared out before you can reconfigure. (Thanks to @moklett for the info.)

Chargify.configure do |c|
  c.site = nil
  c.subdomain = ENV['CHARGIFY_OTHER_SUBDOMAIN']
  c.api_key   = ENV['CHARGIFY_API_KEY']
end

Here is an example of switching sites, with the workaround:
https://github.com/wsmoak/chargify/blob/master/ruby/multiple-sites.rb

Can this be fixed so that reconfiguring is easier?