contexts:
[
    {
        name: "home context",
        keys : [
            {name: "up", events: [myEvent1, myEvent2]},
            { name: "down", events : [myEvent1, myEvent2] }
        ]
    },
    {
        name: "options menu",
              keys : {
                  {name: "up", events : [otherevent, etc]},
                  { name: "down", events : [etc, etc] }
              }
        }
    }
]