Update remote.py

On Python 2.7 (App Engine) the current codes results in a rather unhelpful `Configuring Raven for host: <raven.conf.remote.RemoteConfig object at 0xfa682430>` at startup. It might be better to force Python 2 on base.py at `self.logger.debug("Configuring Raven for host: {0}".format(self.remote))` to evaluate Unicode, but I think at this place it is much more obvious that the code is for Python 2.x sake.

Author: Maximillian Dornseif

raven/conf/remote.py

@@ -57,6 +57,9 @@ def __init__(self, base_url=None, project=None, public_key=None,
     def __unicode__(self):
         return text_type(self.base_url)
 
+    def __str__(self):
+        return text_type(self.base_url)
+
     def is_active(self):
         return all([self.base_url, self.project, self.public_key, self.secret_key])