Support MySQL in CLI

[adamziel]

Emscripten supports proxying raw socket traffic through websockets. In theory, the CLI version of PHP could reach MySQL server and not be constrained to SQLite.

[adamziel]

MySQL is now supported! See #119:

> node ./build-cli/php-cli.js -a
Interactive shell

php > $pdo = new PDO('mysql:host=127.0.0.1; port=55001; dbname=wordpress_develop_tests','root','pw');
php > $r = $pdo->query('select * from pet');
php > print_r( $r->fetchAll() );
Array
(
    [0] => Array
        (
            [name] => Dog
            [0] => Dog
            [owner] => Homer
...