Setting log location to wherever the script is called.

x On a Mac, /var/log/ is owned by root and wheel, with non-writable permissions.
  Temporary workaround until code can be put in to determine
  what OS you are running on, for proper logging location.

csr_tools/csrgen.py

@@ -307,7 +307,7 @@ class Authority(Certificate):
 def main(argv):
     # Define default values
     VERBOSE = False
-    LOG_FILE = "/var/log/certGen.log"
+    LOG_FILE = "./certGen.log"
     LOG_LEVEL = logging.WARNING
     opts = {}