Merge pull request #8 from teleyinex/master

Add control buttons to play pause the animation
Merge pull request #9 from teleyinex/master

Remove previous answer buttons
add 'draw circle' on canvas
Merge branch 'master' of github.com:CERNSummerWebfest/antimatter
Merge pull request #10 from MichaelKohler/master

draw a circle onclick to the canvas
Refactor some code