Add second param conf for shortcuts to conf files

app/js/arethusa.core/routes/main.constant.js

@@ -5,9 +5,26 @@ angular.module('arethusa.core').constant('MAIN_ROUTE', {
   template: '<div ng-include="template"></div>',
   resolve: {
     loadConfiguration: function($q, $http, $route, configurator) {
+      var files = {
+        default: './static/configuration_default.json',
+        staging: './static/configuration1.json'
+      };
+      var params = $route.current.params;
+      var confUrl;
+
+      // Fall back to default and wrong paths to conf files
+      // need to be handled separately eventually
+      if (params.conf) {
+        confUrl = files[params.conf] || files.default;
+      } else if (params.conf_file) {
+        confUrl = params.conf_file;
+      } else {
+        confUrl = files.default;
+      }
+
       return $http({
         method: 'GET',
-        url: $route.current.params.conf || './static/configuration_default.json'
+        url: confUrl,
       }).then(function(result) {
         configurator.configuration = result.data;
       });