fix issue #16, normalize path

lib/cli.js

@@ -66,7 +66,7 @@ function parse (source) {
 function main (args) {
   var source = '';
   if (options.file) {
-    var path = require('path').join(process.cwd(), options.file);
+    var path = require('path').normalize(options.file);
     source = parse(fs.readFileSync(path, "utf8"));
     if (options.inplace) {
       fs.writeSync(fs.openSync(path,'w+'), source, 0, "utf8");