add test to install
add rostest test/tetris.test
*.launch : add INITIAL_POSE_{X,Y,Z} arguments
[doc] Some clarifications
[doc] Seperate gzweb installation
[doc] Minor formatting
doc/sysadmin.rst: add how to use supervisor tool, fix sysadmin tools
set default cmd_vel to 1.0
add rosbridge_websocket.launch to demo.launch
Update index.rst
Contributors: Isaac I.Y. Saito, Kei Okada