For some reason, test_core_go was hanging on Celeste's machine. We nailed the problem down to some issue with the subprocess handling used to extract bzr information into the job header. No idea why this is happening, but the following diff seemed to fix things.

=== modified file 'src/common_py/Go.py'
--- src/common_py/Go.py    2012-11-22 10:36:21 +0000
+++ src/common_py/Go.py    2014-04-17 13:07:58 +0000
@@ -201,10 +201,7 @@
             pass
         try:
             mrd = os.environ["MAUS_ROOT_DIR"]
-            proc = subprocess.Popen(['bzr', 'status', mrd],
-                               stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-            proc.wait()
-            bzr_status = proc.stdout.read()
+            bzr_status = subprocess.check_output(['bzr', 'status', mrd], stderr=subprocess.STDOUT)
         except (OSError, IOError):
             pass
         maus_version = json_datacards["maus_version"]