remove jupyter checkpoints

...oks/.ipynb_checkpoints/tutorial_1_basics-checkpoint.ipynb

.../.ipynb_checkpoints/tutorial_1_filtering-checkpoint.ipynb

...books/.ipynb_checkpoints/tutorial_1_hist-checkpoint.ipynb

...ynb_checkpoints/tutorial_1_visualization-checkpoint.ipynb

.../notebooks/.ipynb_checkpoints/basics_reg-checkpoint.ipynb

...ebooks/.ipynb_checkpoints/multimodal_reg-checkpoint.ipynb

...l_2/notebooks/.ipynb_checkpoints/umeyama-checkpoint.ipynb

...ebooks/.ipynb_checkpoints/em_seg_and_mrf-checkpoint.ipynb

.../.ipynb_checkpoints/em_segm_atlas_priors-checkpoint.ipynb

...otebooks/.ipynb_checkpoints/levelset_seg-checkpoint.ipynb

..._3/notebooks/.ipynb_checkpoints/otsu_thr-checkpoint.ipynb

...ebooks/.ipynb_checkpoints/classification-checkpoint.ipynb

...4/notebooks/.ipynb_checkpoints/pca_shape-checkpoint.ipynb

.../notebooks/.ipynb_checkpoints/regression-checkpoint.ipynb