Adapt doc into ipython notebooks

doc/source/camera_3dtrajectory/cam_calibration.rst

doc/source/camera_3dtrajectory/cam_triangulation.rst

...rce/camera_3dtrajectory/examples/extrinsic_calibration.py

doc/source/camera_3dtrajectory/examples/manhattan.py

doc/source/camera_3dtrajectory/examples/manhattan2d.py

doc/source/camera_3dtrajectory/examples/manhattan_0001.hdf

...e/camera_3dtrajectory/examples/npairwise_triangulation.py

doc/source/camera_3dtrajectory/index.rst

doc/source/classification/examples/saccade_extraction.py

doc/source/classification/examples/saccade_loliplot.py

doc/source/classification/index.rst

doc/source/classification/sac_intersaccade.rst

doc/source/index.rst

doc/source/tutorials/02-recording-animal-trajectory.ipynb

doc/source/tutorials/04-error-propagation.ipynb

doc/source/tutorials/05-classification.ipynb

doc/source/tutorials/index.rst

navipy/maths/euler.py

navipy/tools/__init__.py

navipy/trajectories/__init__.py