fix issue with vue-resource being installed twice

Author: cklmercer

src/http.js

@@ -1,11 +1,14 @@
 import { forIn } from 'lodash';
 import { getFileExtension, isFile } from './helpers';
-import Vue from 'vue';
-import VueResource from 'vue-resource';
-
-Vue.use(VueResource)
 
 export default function (Http = null) {
+
+    if ( ! Http) {
+        var Vue = require('vue');
+        var VueResource = require('vue-resource');
+        Vue.use(VueResource)
+    }
+
    return {
        /*
         * Helper method for submitting a form as a DELETE request.