Merge pull request #11 from firebase/jw-readme-badges

Added README badges

Author: Chris Raynor

README.md

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 # Firebase Queue
 
+[![Build Status](https://travis-ci.org/firebase/firebase-queue.svg?branch=master)](https://travis-ci.org/firebase/firebase-queue)
+[![Coverage Status](https://img.shields.io/coveralls/firebase/firebase-queue.svg?branch=master&style=flat)](https://coveralls.io/r/firebase/firebase-queue)
+[![GitHub version](https://badge.fury.io/gh/firebase%2Ffirebase-queue.svg)](http://badge.fury.io/gh/firebase%2Ffirebase-queue)
+
 A fault-tolerant, multi-worker, multi-stage job pipeline built on Firebase.