data export commit, supports exporting task history via csv

*adds the following new dependencies: moment, express-csv
*recommend replacing functionality of 'relative-date' with features from 'moment'
*supports retrieval of CSV history via the API and in browser
**/api/v1/export/history (requires typical API authorization)
**/export/history.csv (requires session authorization)
*adds new routes for data export

src/routes/dataexport.js

@@ -0,0 +1,9 @@
+var express = require('express');
+var router = new express.Router();
+var dataexport = require('../controllers/dataexport');
+var nconf = require('nconf');
+
+/* Data export */
+router.get('/history.csv',dataexport.auth,dataexport.history); //[todo] encode data output options in the data controller and use these to build routes
+
+module.exports = router;