Add some graphs

[Joey-Taylor]

• [ ] ELO rating against time for everyone with the ability to select the users displayed
• [ ] Win/Loss ratio against time for everyone with the ability to select the users displayed
• [ ] Ranking against time with the ability to select users on display, e.g. this

[Joey-Taylor]

Probably worth looking at this: http://www.asp.net/web-pages/overview/data/7-displaying-data-in-a-chart