Wrote weightedlinear early fusion, tests are passing.

...ti_view_classifiers/monoview_classifiers/decision_tree.py

...w_classifiers/multiview_classifiers/additions/__init__.py

...view_classifiers/multiview_classifiers/additions/utils.py

...ers/multiview_classifiers/weighted_linear_early_fusion.py

...ultiview_classifiers/test_weighted_linear_early_fusion.py