Gruntfile.js

//[...]    
webfont:                                 
    {                                        
      icons:                                 
      {                                      
        src: 'font/baked/*.svg',             
        dest: 'app/webroot/fonts',           
        destCss: 'less',                     
        options:                             
        {                                    
          stylesheet : 'less',               
          font : 'marblefallen',                
          hashes : false,                    
          syntax : 'bem',                    
          htmlDemo : false,                  
          relativeFontPath : '@{fonts}',     
          templateOptions :                  
          {                                  
            baseClass : 'ma',                
            classPrefix : 'ma-',             
            mixinPrefix : 'ma-mixin-'        
          }                                  
        }                                    
      }                                      
                                             
  }                                          
});                                          
  grunt.loadNpmTasks('grunt-webfont');       
  grunt.registerTask('font', ['webfont']);     
};

swim-circle.svg

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test.html

<!DOCTYPE html>                                                   
<html lang="en">                                                  
<head>                                                            
  <meta charset="UTF-8">                                          
  <title></title>                                                 
  <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">                               
  <link href="main.css" rel="stylesheet">                         
</head>                                                           
<body>                                                            
  <button class="btn btn-primary btn-lg"><i class="ma ma-swim-circle"></i> Test</button>                                            
</body>                                                           
</html>