issue 18: Explicitly use chmod to set directory modes (ulimit is currently 0007).

Author: JulienPalard

build_docs.py

@@ -173,7 +173,8 @@ def build_one(version, isdev, quick, sphinxbuild, build_root, www_root,
                        '-D gettext_compact=0').format(locale_dirs,
                                                       gettext_language_tag)
     if not os.path.exists(target):
-        os.makedirs(target, mode=0o775)
+        os.makedirs(target)
+    os.chmod(target, 0o775)
     shell_out("chgrp -R {group} {file}".format(group=group, file=target))
     logging.info("Doc autobuild started in %s", checkout)
     os.chdir(checkout)