i10: enhance status output

[ptitzler]

Sample output.

{
  "status_date": "Wed Sep 07 2016 13:23:30 GMT-0700 (Pacific Daylight Time)",
  "status": {
    "initialized": true,
    "copied": 0,
    "failed": 0,
    "filtered": 0,
    "last_change_received": null,
    "last_change_applied": null,
    "last_update_seq": 0,
    "filter": {
      "server": {
        "name": "troubleshooting/recent_boston",
        "definition": "function(doc, req) {if (doc.properties && doc.properties.source && doc.properties.source === 'Boston') {var thedate = new Date();thedate.setDate(thedate.getDate() - 7);return doc.properties.timestamp >= thedate.valueOf();}return false;}"
      },
      "client": {
        "name": "sample_filter_functions/ignore_deleted_documents.js",
        "definition": "function (change) {\r\n\tif((! change) || (change.deleted)) {\r\n\t\treturn false;\r\n\t}\r\n\telse {\r\n\t\treturn true;\r\n\t}\r\n}"
      }
    },
    "transformer": {
      "name": "sample_transform_functions/no_transformation.js",
      "definition": "function (doc) {\r\n\r\n\t// do nothing\r\n\t\r\n\treturn doc;\r\n}"
    }
  }
}

• filter.server.name: If set, identifies the <design_doc/filter_name> that contains the filter being used by CouchDB to exclude documents from the change feed.
• filter.server.definition: The source code for <design_doc/filter_name>.
• filter.client.name: If set, identifies the file that contains the filter routine that is applied to all documents in the change feed.
• filter.client.definition: The source code for filter.client.name.
• transformer.name: If set, identifies the file that contains the transformation routine that is applied to all documents that have passed filter.client.name.
• transformer.definition: The source code for transformer.name.