start with download data routine
forgot about R implicitly returning last value
zip archive has multiple files, so getrawdata() should take a filename arg
forgot one item in the list of what run_analysis needs to do
summary comment for getrawdata()
functions to get activity and feature labels
functions to subset features into those that are mean or stddev
extract measurements and subset to mean/sd columns only
add the activities and subjects to make intermediate data set
merge together training and test datasets
create final tidy data set and write to csv file
subject.activity.averages() was all wrong
use full-size data