Changes to be committed:
	new file:   plot1.R
	new file:   plot1.png
	new file:   plot2.R
	new file:   plot2.png
	new file:   plot3.R
	new file:   plot3.png
	new file:   plot4.R
	new file:   plot4.png
 Changes not staged for commit:
Merge https://github.com/ashwintk/ExData_Plotting1