Core endpoint for stats

[kasp1]

There should be a way for the UI to retrieve stats from the server side.

It may be an endpoint handler for GET /apiko/stats

Perhaps it would be convenient to put the handler in /src/apiko/stats/get.js in the same way as for example the /src/apiko/core/get.js exists.

This endpoint should also be registered in the core part of server's setup (/src/core.js), extending the endpoints object with for example:

'GET /apiko/core': {
  extendable: false,
  comment: 'Stats data with optional interval parameters. If no interval is set, data for the recent 30 days will be returned.
  handlers: {
    core: './apiko/stats/get'
  },
  params: {
    start: {
      required: false,
      regex: '^\\d+$',
      comment: 'Time interval start for the requested stats as an UNIX timestamp.'
    },
    end: {
      required: false,
      regex: '^\\d+$',
      comment: 'Time interval end for the requested stats as an UNIX timestamp.'
    },
  }
}

[kasp1]

Fixed by #8