Output to stdout instead of stderr

Fixes #645

overviewer_core/settingsDefinition.py

@@ -97,9 +97,9 @@ processes = Setting(required=True, validator=int, default=-1)
 # ends up adding overhead and isn't worth it.
 memcached_host = Setting(required=False, validator=str, default=None)
 
-if platform.system() == 'Windows' or not sys.stderr.isatty():
+if platform.system() == 'Windows' or not sys.stdout.isatty():
     obs = LoggingObserver()
 else:
-    obs = ProgressBarObserver()
+    obs = ProgressBarObserver(fd=sys.stdout)
 
 observer = Setting(required=True, validator=validateObserver, default=obs)