Serverless local runtime plugin

Require Serverless^0.5

Add supports for local Node runtime with Serverless 0.5

Supports:

• Run local lambda on a child_process when call sls function run. In the child process, function are evaluated with flags given to s-project.json

Usage:

• Turn runtime setting in s-function.json to local-node
• In s-project.json, add to custom field as following

    "custom": {
      "local-node": { // support only local-node
        "deploymentVersion": 'nodejs6.10', // enum ['nodejs6.10', 'nodejs4.3'], defaults to 'nodejs4.3'
        "flags": [
          --harmony
          --harmony-async-await
          // Your flags here
        ]
      }
    }