4.2.1

Fix some issues found after release as well as some minor enhancements.

Update api.class.php

4.0.1

* Bug fix that would cause albums to be recreated in Album::check
* Added 'file' to Song::find

tag as 4.0.0-release

Merge branch 'master' of https://github.com/ampache/ampache

Pulled changes made on github.