First import
Updated README.
Released head from gait module in simulation.
Removed usless contactProperties in some world files.
Merge pull request #143 from DavidMansolino/Readme

Updated README.
Merge pull request #144 from DavidMansolino/Gait

Released head from gait module in simulation.
Set basicTimeStep of the world to 16.
Update changelog.
Merge pull request #145 from DavidMansolino/World

World