Add Travis and Coveralls badges

Author: PhenX

README.md

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 # SVG file parsing / rendering library
 
+[![Build Status](https://travis-ci.org/PhenX/php-svg-lib.svg?branch=master)](https://travis-ci.org/PhenX/php-svg-lib)
+[![Coverage Status](https://coveralls.io/repos/PhenX/php-svg-lib/badge.svg)](https://coveralls.io/r/PhenX/php-svg-lib)
+
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+[![Latest Stable Version](https://poser.pugx.org/phenx/php-svg-lib/v/stable)](https://packagist.org/packages/phenx/php-svg-lib) 
+[![Total Downloads](https://poser.pugx.org/phenx/php-svg-lib/downloads)](https://packagist.org/packages/phenx/php-svg-lib) 
+[![Latest Unstable Version](https://poser.pugx.org/phenx/php-svg-lib/v/unstable)](https://packagist.org/packages/phenx/php-svg-lib) 
+[![License](https://poser.pugx.org/phenx/php-svg-lib/license)](https://packagist.org/packages/phenx/php-svg-lib)
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 The main purpose of this lib is to rasterize SVG to a surface which can be an image or a PDF for example, through a `\Svg\Surface` PHP interface.
 
 This project was initialized by the need to render SVG documents inside PDF files for the [DomPdf](http://dompdf.github.io) project.