adding oracle param support related to #137 (#149)

* adding oracle param support related to #137

* fix copy paste error

Author: Kevin Glinski

tableaudocumentapi/connection.py

@@ -16,6 +16,8 @@ def __init__(self, connxml):
         self._server = connxml.get('server')
         self._username = connxml.get('username')
         self._authentication = connxml.get('authentication')
+        self._schema = connxml.get('schema')
+        self._service = connxml.get('service')
         self._class = connxml.get('class')
         self._schema = connxml.get('schema')
         self._service = connxml.get('service')