Development version updates:

* Clarification and recent changes in README file
* Add hackish but convenient batch file processing support (*nix systems)
* Fix mkvinfo output to always use en_US language (see pull requests https://github.com/jbillo/xenonmkv/pull/14 and https://github.com/jbillo/xenonmkv/pull/15)
* Remove neroAacEnc dependency/requirement so that application starts properly