Downloading files

Usage:
```javascript
mysqldump: {
    files: {
        //local dest and remote src
        'test1/': 'includes/language', // Copy remove directory to local directory
        'test1/dump.sql': 'index.php',
        'dump.sql': 'index.php'
    },
    options: {
        createDirectories: true,
        directoryPermissions: parseInt(755, 8),
        path: '<%= secret.path %>',
        host: '<%= secret.host %>',
        username: '<%= secret.username %>',
        password: '<%= secret.password %>',
        showProgress: true,
        srcBasePath: '<%= secret.path %>/public_html/', // Base relatively remote path options
        destBasePath: __dirname, // Local base
        mode: 'download' // Or upload
    }
}
```