run_analysis.R does the following to meet the requirements of the assignment:
Reads the training and test set components
Combines the components into complete sets
Uses descriptive activity names to name the activities in the data set (requirement #3)
Merges the training and the test sets to create one data set (requirement #1)
Extracts only the measurements on the mean and standard deviation for each measurement (requirement #2)
Appropriately labels the data set with descriptive activity names (requirement #4)
Creates a tidy data set with the average of each variable for each activity and each subject (requirement #5)