Nested multi-level $lambda + $return.success bug

[gliechtenstein]

Looks like there's something wrong when there's more than one level of trigger + $return.success combo.

For example, this works fine until the encoding_test and filter_test calls but stops right before sha256_test.

{
  "actions": {
        "$load": {
          "type": "$script.include",
          "options": {
            "items": [
              {
                "url": "https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"
              },
              {
                "text": "var randomcolor = function() { return '#'+Math.floor(Math.random()*16777215).toString(16); }"
              },
              {
                "url": "https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/crypto-js.min.js"
              },
              {
                "url": "https://rawgit.com/mathiasbynens/he/master/he.js"
              }
            ]
          },
          "success": {
            "trigger": "encoding_test",
            "options": {
              "text": "brian's page"
            },
            "success": {
              "trigger": "filter_test",
              "success": {
                "trigger": "sha256_test"
              }
            }
          }
        }
  }
}