Mention /tests/index.html in Testing Introduction
Mention /tests/index.html in Testing Introduction

I thought it might be worth mentioning that the `/tests` URI renders the `tests/index.html` template, incase someone need to customize it, or add some 3rd party code (test google maps or something similiar without stubbing the API?)

I didn't see the file mentioned anywhere else in the docs, I apologize if I missed it!

davidpett/guides,ubuntuvim/guides,grapho/guides,tleskin/guides,bmac/guides,vikram7/guides,jkarsrud/guides,knownasilya/guides,papilip/emberjs-guides-french,HeroicEric/guides,davidpett/guides,knownasilya/guides,MarkMT/guides,greyhwndz/guides,szines/guides,jkarsrud/guides,grapho/guides,boztek/guides,knownasilya/guides,greyhwndz/guides,papilip/emberjs-guides-french,greyhwndz/guides,grapho/guides,vikram7/guides,nicobot/guides,jackfranklin/guides,bmac/guides,davidpett/guides,tleskin/guides,nicobot/guides,tleskin/guides,ubuntuvim/guides,boztek/guides,HeroicEric/guides,szines/guides,szines/guides,MarkMT/guides,bmac/guides,skaterdav85/guides,MarkMT/guides,knownasilya/guides,jackfranklin/guides,nicobot/guides,MarkMT/guides,davidpett/guides,ubuntuvim/guides,ubuntuvim/guides,bmac/guides,jkarsrud/guides,jackfranklin/guides,skaterdav85/guides,skaterdav85/guides,HeroicEric/guides,boztek/guides,skaterdav85/guides,papilip/emberjs-guides-french,jkarsrud/guides,vikram7/guides