add the pitch of the foot

...TrajectoryGeneration/FootTrajectoryGenerationAbstract.cpp

...tTrajectoryGeneration/FootTrajectoryGenerationAbstract.hh

...neration/LeftAndRightFootTrajectoryGenerationMultiple.cpp

...eneration/LeftAndRightFootTrajectoryGenerationMultiple.hh

src/ZMPRefTrajectoryGeneration/ZMPVelocityReferencedQP.cpp

src/ZMPRefTrajectoryGeneration/mpc-trajectory-generation.cpp

src/ZMPRefTrajectoryGeneration/mpc-trajectory-generation.hh

tests/TestHerdt2010DynamicFilter.cpp

tests/TestMorisawa2007.cpp