Adding test_model-base-ekf-flex-estimator-imu.cpp
Modification of test-model-base-ekf-flex-estimator-imu
Fixing innovation by fixing AccAngular and Fc optimization
Iros2014 identified coefficients for flexibility stifness
Merge pull request #2 from amifsud/master

adding unit-testings/test_model-base-ekf-flex-estimator-imu.cpp an fixing innovation