Update PA1_template.Rmd

Committed July 18, 2014
![plot1 to q1 histogram](https://cloud.githubusercontent.com/assets/7371016/3627250/2316f15e-0e87-11e4-9817-d80960b390c5.png)

![plot2 q2 ts plot](https://cloud.githubusercontent.com/assets/7371016/3627254/3047ea22-0e87-11e4-9d24-5f27538bbb06.png)

![plot3 q3 histogram w imputed missing values](https://cloud.githubusercontent.com/assets/7371016/3627256/367739e8-0e87-11e4-8943-ce7007bad777.png)

![plot4 q4 weekdays v weekends](https://cloud.githubusercontent.com/assets/7371016/3627259/3db8e788-0e87-11e4-89c3-9a150c7d5321.png)