[DO NOT MERGE] Develop/spot arm

[sktometometo]

Develop branch for spot (sktometometo version)

Based on https://github.com/jsk-ros-pkg/jsk_robot/pull/1701

Merged folloing PRs

• https://github.com/k-okada/jsk_robot/pull/99
• https://github.com/k-okada/jsk_robot/pull/96
• https://github.com/k-okada/jsk_robot/pull/95
• https://github.com/k-okada/jsk_robot/pull/105
• https://github.com/k-okada/jsk_robot/pull/106
• https://github.com/k-okada/jsk_robot/pull/109
• https://github.com/k-okada/jsk_robot/pull/108
• https://github.com/k-okada/jsk_robot/pull/107
• https://github.com/k-okada/jsk_robot/pull/110
• https://github.com/k-okada/jsk_robot/pull/111

Follwing PRs are being tested but not merged

• https://github.com/k-okada/jsk_robot/pull/97