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

public/js/app.js

@@ -61,6 +61,10 @@ window.habitrpg = angular.module('habitrpg',
           url: "/profile",
           templateUrl: "partials/options.profile.profile.html"
         })
+        .state('options.profile.data', {
+          url: "/profile/data",
+          templateUrl: "partials/options.profile.data.html"
+        })
 
         // Options > Groups
         .state('options.social', {