Update lib/uploadhandler.js

update resize with cropping custom options : customArgs
ex)
thumbnail:{
    width:80,
    height:"80^",
    customArgs: [
        "-gravity", "center",
        "-extent", "80x80"
    ]
}

Author: soomtong

lib/uploadhandler.js

@@ -109,7 +109,7 @@ module.exports = function (options) {
                                     height: opts.height,
                                     srcPath: options.uploadDir() + '/' + fileInfo.name,
                                     dstPath: options.uploadDir() + '/' + version + '/' + fileInfo.name,
-                                    customArgs: ['-auto-orient']
+                                    customArgs: opts.customArgs || ['-auto-orient']
                                 }, finish);
                             });
                         }