Completes first three sections

The loading and processing of the data, the calculation of mean steps
per day, the average daily pattern and the first step of identifying the
missing values
Completes Assignment less the final graph

This still needs debugging as the knit doesn't seem to be working and is
missing the final weekday/weekend chart.
Finishes assignment, errors and warnings

The assignment is complete. However, when run with knitr, each line of
code produces an error.
Final Commit

This commit completes the assignment and fixes the remaining errors.
Final Commit Names Plots

This commit is also of the final assignment product but adds names to
the data chunks for the figure values.