Complete Ex7 - K-Means Clustering and PCA

Part 1: Find Closest Centroids (k-Means) [ findClosestCentroids.m ]
Part 2: Compute Centroid Means (k-Means) [ computeCentroids.m ]
Part 3: PCA [ pca.m ]
Part 4: Project Data (PCA) [ projectData.m ]
Part 5: Recover Data (PCA) [ recoverData.m ]