import config from index.js instead of from config.js (#115)

This allows for someone to stub functions.config() properly from a unit test.

Author: laurenzlong

spec/providers/database.spec.ts

@@ -24,7 +24,7 @@ import * as database from '../../src/providers/database';
 import { expect as expect } from 'chai';
 import { fakeConfig } from '../support/helpers';
 import {apps as appsNamespace} from '../../src/apps';
-import {config} from '../../src/config';
+import {config} from '../../src/index';
 
 describe('DatabaseBuilder', () => {
 

spec/providers/storage.spec.ts

@@ -23,7 +23,7 @@
 import * as storage from '../../src/providers/storage';
 import { expect as expect } from 'chai';
 import {fakeConfig} from '../support/helpers';
-import {config} from '../../src/config';
+import {config} from '../../src/index';
 
 describe('storage.FunctionBuilder', () => {
   before(() => {

src/apps.ts

@@ -22,7 +22,7 @@
 
 import * as _ from 'lodash';
 import * as firebase from 'firebase-admin';
-import {config} from './config';
+import {config} from './index';
 import sha1 = require('sha1');
 
 /** @internal */