Fix for windows CSV writer newline issue.

Closes #710

Author: DavidCEllis

axelrod/tournament.py

@@ -63,7 +63,7 @@ def setup_output_file(self, filename=None):
             # Setup a temporary file
             self.outputfile = NamedTemporaryFile(mode='w')
             filename = self.outputfile.name
-        self.writer = csv.writer(self.outputfile)
+        self.writer = csv.writer(self.outputfile, lineterminator='\n')
         # Save filename for loading ResultSet later
         self.filename = filename