first pass at #50 (yapf hook)

pre_commit_hooks/yapf_wrapper.py

@@ -0,0 +1,17 @@
+from __future__ import absolute_import
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import io
+import sys
+
+import yapf
+
+
+def main(argv=None):
+    argv = argv if argv is not None else sys.argv[1:]
+    return yapf.main(argv)
+
+
+if __name__ == '__main__':
+    exit(main())