Added initial code to unzip and load csv file.  Additionally added base code for dplyr package which will be used to manipulate tbl_df data set.
Setting up date.
Before change to switch.
Added comments.  Did group by with dplyr.  Did some basic aggregations.
Add histogram of total steps by date.
Finished part #1 calculating median and mean.  Also finished plot.
Added line graph showing average steps taken by 5-minute interval within day.
Before changes to x-axis and y-axis of line graph.
Fixed x-axis tick mark labeling.
Fixed formatting of x-axis and cleaned up code.
Removed NAs from original data set
Added cleaner code to update steps that are NA.
Removed old way of updating NAs that utilized for loop.
Added code to compare & contrast the activity data sets with and without NAs filled in.
Added in ggplot line graphs showing differences between weekday and weekend step activity.
Added PA1_template.html to be posted up to GitHub.
Committing PA1_template.md file to be posted to GitHub.  This was autogenerated by the Rmd file.
Committing figures.