On fail or exception exit with non-zero code.

Also, on exceptions print the exception stacktrace.

naive-nlu/tree_nlu/test.py

@@ -1,3 +1,4 @@
+import traceback
 import logging
 from .tests import basic
 from .tests import gac_100
@@ -10,15 +11,22 @@ tests = (
 )
 
 def main():
+    failed = False
     for test_name, test_module in tests:
         try:
             test_module.main()
             print(" \x1b[1;32m✓\x1b[0m {}".format(test_name))
         except AssertionError as ae:
             print(" \x1b[1;31m✗\x1b[0m {}: {}".format(test_name, ae.args[0]))
+            failed = True
+
         except Exception as e:
             print(" \x1b[1;7;31m!\x1b[0m {} {}".format(test_name, e))
-            raise
+            failed = True
+            traceback.print_exc()
+
+    if failed:
+        exit(1)
 
 if __name__ == '__main__':
     main()