Moved trajectory visualization from ROSInterface to new file.
Enhanced trajectory visualization features.
Merge pull request #31 from perezsolerj/hydro-devel

Moved trajectory visualization from ROSInterface to new file.
Added Force Sensor using bullet collision reactions.
Modified dynamics module to use this force sensor as force input.
Merge branch 'hydro-devel' of https://github.com/uji-ros-pkg/underwater_simulation into hydro-devel
Adding ForceSensor missing files on last commit.
Removed robot_state_publisher source download from travis, no longer needed.