make it easier to setup more diverse exact requests
make it easier to setup more diverse exact requests

These changes make the requests to exact slightly more flexible to configure.
This is useful to reuse the Request class also connecting to the XML-API of exact.
exactonline/exactonline-api-ruby-client,MelnikVasya/exactonline-api-ruby-client,MelnikVasya/exactonline-api-ruby-client,exactonline/exactonline-api-ruby-client