xflow 0.1.1

XFlow implementation
Documentation 
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{
  "id": "add",
  "name": "add",
  "version": 1,
  "requirements": [
    {
      "xtype": "flow",
      "version": 1
    },
    {
      "xtype": "flox",
      "version": 1
    }
  ],
  "variables" : {
    "input" : [
      {
        "name"  : "ValueA",
        "vtype"  : "number",
        "value" : "4"
      },
      {
        "name"  : "ValueB",
        "vtype"  : "number",
        "value" : "5"
      }
    ],
    "output" : [
      {
        "vtype" : "number",
        "name" : "ReturnValue"
      }
    ],
    "local" : [
      {
        "vtype" : "boolean",
        "name" : "ReturnValue",
        "value" : "false"
      }
    ]
  },
  "nodes": [
    {
      "id": 1,
      "nodetype": "flow",
      "action": "start",
      "label" : "Start",
      "parameters": {}
    },
    {
      "id": 2,
      "nodetype": "flox",
      "action": "evalexpr",
      "label" : "Flox",
      "parameters": {
        "expression" : "$ValueA+$ValueB",
        "returns"    : {
          "name"   : "ReturnValue",
          "vtype"   : "number"
        }
      }
    },
    {
      "id": 3,
      "nodetype": "flow",
      "action": "end",
      "label" : "End",
      "parameters": {}
    }
  ],
  "edges": [
    [ 1, 2 ],
    [ 2, 3 ]
  ],
  "branches" :[
  ]
}