Merge pull request #23 from francois-keith/master

Add Homogeneous To position entity  + correct derivator class
Fix warnings.
[tools] Add seqid output signal to joint-trajectory-entity.
[cmake] Synchronize
[tools] Declares seqid in the pool of signals.
Set the signal values AFTER the integration
Merge pull request #24 from mehdi-benallegue/master

Set the signal values AFTER the integration
Set signal values after integrate but before "after" periodic call
Merge pull request #26 from gergondet/topic/FixSignalValuesSetting

Set signal values after integrate but before "after" periodic call
Add const in the controller interface, remove useless semi-colon
Make the velocity signal available even when the robot is not controlled by acceleration.

This setting enables to have the value of the velocity independently from the control.
Merge pull request #25 from mehdi-benallegue/master

Make the velocity signal available even when the robot is not controlled...
Add a unary operator that computes the norm of a vector.