* added overview for AdaBoost

* added implementation for AdaBoost

* added example for AdaBoost

* added tests for AdaBoost

* rephrased sentences

* final changes to AdaBoost

* changed adaboost tests to use grade_learner

* grammar check

* added example for Decision Tree Learner

* fixed docstring in learning.py and description in learning.ipynb

Closes #673

* remove mnist from learning.ipynb

* add learning applications

* Update learning.ipynb

* Add files via upload

* Minor fixes

* Typo fix

* Added decisiontreelearner to notebook

* Added RandomForest

* Update learning.ipynb

* Update csp.ipynb

* Update games.ipynb

* Update learning.ipynb

* Update notebook.py

* Update .travis.yml

* Update learning.ipynb

* Update learning.ipynb

* Update learning.ipynb

* Delete multilayer_perceptron.png

* Add files via upload

* Update learning.ipynb

* Add files via upload

* Update learning.ipynb

* Update test_learning.py

* Resolve conflicts

* Update learning.ipynb

* Delete perceptron.png

* Add new Perceptron image

* Update Perceptron Implementation

* Update learning.py

* Add Euclidean Distance

* Update learning.ipynb

* minor fix in notebook

* minor spacing in learning.py

* Added Euclidean Test

* Add Perceptron Section

* Add Perceptron Image

Make load_MNIST function easier to read

* Added Plurality Learner Plot Image

* Update learning.ipynb

this classifier of learning module is not optimized to run on this huge MNIST data

- Fix relative imports in base of is a package or not
- Fix not working notebooks
- Add notebooks to packages sources