Analysis script for get_data project

To successfully run this script Place the following seven data files in the working directory;
from https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip 
1.features.txt,
2-4. subject_train.txt, X_train.txt, y_train.txt
5-7. subject_test.txt, X_test.txt, y_test.txt