Added ANYmal b (this is now open-source and legally possible)

See merge request gepetto/example-robot-data!14

add ur_description, fix #7

See merge request gepetto/example-robot-data!13

from https://github.com/ros-industrial/universal_robot/tree/kinetic-devel/ur_description

some models don't have robot parameters, fix #13

See merge request gepetto/example-robot-data!12

to comply with other packages

Added solo robot + fixed bug in the unit-test

See merge request !11

to ease robotpkg packaging

s.t. Pinocchio can depend on the data, and we can provide simultaneously
several python versions

Added the loading function for talos legs + removed an path append inside display

See merge request !10