Port some branches in master

[gabrielenava]

I'm referring to these branches:

• walkman

• icub_standUp

• seesaw

I think I can port all these controllers in master. In particular:

• seesaw has its own folder in master, and won't affect the main balancing controller;
• walkman just add the config files for walkman. We can move the model for calibration in the walkman-element;
• icub_standUp add a new state machine in the model, but it shouldn't affect the state machine for yoga.

I think it is probably easier to port the part of the code related to these demos in master instead of merging the branches.

[gabrielenava]

done with https://github.com/robotology-playground/WBI-Toolbox-controllers/commit/96fd372de2257bf603ea2a4f7dfef6581b631d85