MySQL import file feature

I've added a feature to my fork that allows you to specify a file to be imported by mysql.  I use this feature to load a test database before testing.  Here is the syntax:

    setup:
        mysql:
            - "DROP DATABASE IF EXISTS phpunit_test_myapp;"
            - "CREATE DATABASE phpunit_test_myapp;"
            - "GRANT ALL PRIVILEGES ON phpunit_test_myapp.* TO phpunit_tester@'localhost' IDENTIFIED BY 'phpunit';"
        
            # Import/execute a file, note that files are relative to the build dir
            - import: { file: "data/myapp.sql" }
        
            # Chances are good that you need to specify the database name, do it like this:
            - import: { file: "data/myapp.sql", database: phpunit_test_myapp }

            # You can even import GZIP and BZIP2 compressed files if they end in .gz or .bz2:
            - import: { file: "data/myapp.sql.gz", database: phpunit_test_myapp }

            # Queries are run in order, so you can have more queries later:
            - "INSERT INTO user (username, password) VALUES ('foo', 'bar');"

This is done via the shell, which means Windows will not be well supported, but I don't think this represents a security risk since the specified file is passed to MySQL via STDOUT/STDIN and the MySQL client is running under the specified privileges.  It would be cool to do this in PDO directly, but I imagine that will be tricky.