Set the encoding on the XML builder explictly to utf-8.
While it may be useful to be able to pass an encoding for the XML,
UTF-8 will be correct in most cases, and a fixed utf-8 encoding
is preferable to setting no encoding at all.
Coverage remained the same at 100.0% when pulling 72dfe8c35ed21e3406c6b1722a344bd30de5ad8f on betterplace:master into 28aafdbba5cfc62f4ed6cfd7e6e573ae07916760 on salesking:master.
Set the encoding on the XML builder explictly to utf-8.
While it may be useful to be able to pass an encoding for the XML, UTF-8 will be correct in most cases, and a fixed utf-8 encoding is preferable to setting no encoding at all.
This should fix #85 and #87