Run importjsd start --parent-pid n

I introduced a bug in import-js that presents when running `importjsd
--parent-pid n` instead of `importjsd start --parent-pid n`. So, I am
updating this plugin to work around that bug. This will likely be better
anyway.

More info: Galooshi/import-js#345

import-js.py

@@ -104,7 +104,7 @@ def start_or_get_daemon(self, cwd):
 
         try:
             daemon = subprocess.Popen(
-                [executable, '--parent-pid', str(os.getppid())],
+                [executable, 'start', '--parent-pid', str(os.getppid())],
                 cwd=cwd,
                 env=import_js_environment,
                 stdin=subprocess.PIPE,