Increased minimum height of the graphs. Also edited LineGraph title to mention the type of activity it displays.
Fixed bug where the graphs wouldn't be saved if you removed them all. Instead, the graphs came back. Repeated this fix with the activity code as well.
Added Pie Graph functionality
Merge origin/Sumbhav into Sumbhav
Added comments and fixed a potential issue in the Bar graph.
Fixed bug with pie graph not being displayed properly.