add code climate and travis

README

 MimeMagic is a library to detect the mime type of a file by extension or by content.
 
+[![Build Status](https://secure.travis-ci.org/minad/mimemagic.png?branch=master)](http://travis-ci.org/minad/mimemagic)[![Code Climate](https://codeclimate.com/badge.png)](https://codeclimate.com/github/minad/mimemagic)
+
 Usage
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