Add dashboard for hrpsys_gazebo_atlas

You can send command to set gazebo simulation mode by dashboard.
ー sevo on/off
ー user / stand mode
ー pinned / unpinned
ー close / open hand
![a](https://cloud.githubusercontent.com/assets/6636600/3428724/0cab9cda-0045-11e4-84e8-44de729ef046.png)