Support systemd service file

I create a script to generate systemd service file and create it when run ```make``` command.
And, I add lines to spec file to install the service file.
It's typo. Thank you for your pointing out.
I was wrong and cause of wrong that I couldn't find wrong is that the script is implemented in running make command (Following)
``` Makefile
hatohol.service:
	sh generate_service_file.sh > hatohol.service
```

I fix it at 35edbce revision.