fix commit failure under cygwin/git

Author: phuslu

commit.py

@@ -121,10 +121,11 @@ def message_done(self, message):
         message_file.close()
         self.message_file = message_file
         # and actually commit
-        self.run_command(['git', 'commit', '-F', message_file.name, self.extra_options],
-            self.commit_done, working_dir=self.working_dir)
+        with open(message_file.name, 'r') as fp:
+            self.run_command(['git', 'commit', '-F', '-', self.extra_options],
+                self.commit_done, working_dir=self.working_dir, stdin=fp.read())
 
-    def commit_done(self, result):
+    def commit_done(self, result, **kwargs):
         os.remove(self.message_file.name)
         self.panel(result)