Merge pull request #251 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

Author: joshkurz

README.md

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 # ui-calendar directive [![Build Status](https://travis-ci.org/angular-ui/ui-calendar.svg?branch=master)](https://travis-ci.org/angular-ui/ui-calendar)
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+[![Join the chat at https://gitter.im/angular-ui/ui-calendar](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/angular-ui/ui-calendar?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 A complete AngularJS directive for the Arshaw FullCalendar.