Adding Badge for build status

Author: digitalBush

README.md

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 Masked Input Plugin for jQuery
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+[![Build Status](https://travis-ci.org/digitalBush/jquery.maskedinput.png)](https://travis-ci.org/digitalBush/jquery.maskedinput)
 Overview
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 This is a masked input plugin for the jQuery javascript library. It allows a user to more easily enter fixed width input where you would like them to enter the data in a certain format (dates,phone numbers, etc). It has been tested on Internet Explorer, Firefox, Safari, Opera, and Chrome.  A mask is defined by a format made up of mask literals and mask definitions. Any character not in the definitions list below is considered a mask literal. Mask literals will be automatically entered for the user as they type and will not be able to be removed by the user.The following mask definitions are predefined: