Basicmlpy

* Created the basicMLpy.decomposition module. This module contains an implementation of the SVD and PCA algorithms.
* Fixed bugs with basicMLpy.utils functions.

Complete overhaul of all previous basicMLpy modules
* Models no longer automatically perform train_test_split
* Optimized the code for the LinearRegression, IRLSClassifier and CrossValidation classes
* Models are now simpler and more effective
* Added two new modules(utils,loss_functions)
* Renamed cross_validation module to model_selection