Check box email plugin for roundcube

Introduction
----------------------------------------
This is plugin for roundcube

Install
----------------------------------------
1- Add the plugin to roundcube $config['plugins'] array like:

$config['plugins'] = array(
    'chbox',
);

2- Add 'chbox' column to $rcmail_config['list_cols'] array like:

$rcmail_config['list_cols'] = array('chbox','subject','status', 'from', 'date', 'size', 'flag', 'attachment','list_cols');

Testing
----------------------------------------
RoundCube 1.1.0