(Robot installer) accept hrpsys version via argument

Please DO NOT MERGE YET. 
Being tested now.
- [x] Install NXO model.
- [x] For Hiro, respect models that are already installed.
- [x] Install OSS controller into `/opt/jsk`, categorized per version (`/opt/jsk/%VERSION%`). Create symlink from /opt/jsk to the appropriate version.
- [ ] Integrate running `robot-install-qnx-%MAC_ADDR_QNX% %HOST_QNX% %USER_QNX%` (discussed https://github.com/tork-a/delivery/issues/33#issuecomment-67120688)
- [x] Create tork user if it not exists (on Hironx only. On NXO it should exist).
- [ ] For NXO, embed the password of `tork` user so that the user doesn't need to know its password, let alone type it in.
- [x] this doesn't have to be made soon but update existing symlinks. e.g. if `/opt/jsk/bin --> /opt/jsk/315.2.7/bin` exists and new hrpsys getting installed is `315.2.8`, after runing the command we want:

     `/opt/jsk/bin --> /opt/jsk/315.2.8/bin`
     `/opt/jsk/315.2.7/bin`
     :
     `/opt/jsk/315.2.8/bin`
     :