Implemented a cheatsheet for week 6

Implemented a cheatsheet for neural networks

Week 5 implemented a fully vectorized version of the regularized cost function J

Week 5 implemented a fully vectorized cost function for neural networks

Week 4 implemented a cheatsheet for Multi-class classification

Week 3 improved the Logistic Regression cheatsheet

Week 2 added some improvements to the cheatsheet for this weekend

Week 9 implemented regularized gradient

Week 9 implemented regularized cost function

Week 9 implemented Collaborative Filtering Gradient function

Week 9 implemented function for calculating colaborative filtering cost

Week 9 implemented function for estimating gaussian parameters

Week 8 implemented PCA function for recovering the x projected data from z

Week 8 implemented function for PCA that projects data into k dimension

Week 8 implemented PCA function which calculates U matrix for PCA