Allow sending Events in a bulk

[tylkomat]

Like with bulk Subscriptions it would be nice if pushd could accept events in a bulk. The endpoint would be /event and it could accept a json object. For example:

{
    "user.newVideo:fkwhpd":{
        "msg":"${var.name} sent a new video: ${var.title}",
        "msg.fr":"${var.name} a envoyé une nouvelle video: ${var.title}",
        "sound":"newVideo.mp3",
        "data.user_id":"fkwhpd"
        "data.video_id":"1k3dxk"
        "var.name":"Jone Doe",
        "var.title":"Super awesome video"
    },

    "other.event.name":{
        ....
    }
}