added function call counter
added function call counter

anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground-PennApps2015s,anuragbakshi/Javascript-Playground,anuragbakshi/Javascript-Playground