Ignore plugin_manager plugin. Allow packagist.

till

2012-10-28 f2bc8599f850131bb4118ebd5dd7118717d50c24

 composer.json-dist

@@ -4,9 +4,6 @@
    "license": "GPL-3.0",
    "repositories": [
        {
            "packagist": false
        },
        {
            "type": "composer",
            "url": "http://plugins.roundcube.net/"
        },