Drop Doctrine\DBAL\Version in favor of Ocramius\PackageVersions

Specify the platform configuration in composer.json

Deprecate calling QueryBuilder methods with an array argument

Prepare CompositeExpression for immutability

First parameter of ExpressionBuilder::and/or() mandatory

Rename andX() / orX() methods

Added builds against PHP nightly on Travis

According to the [documentation](https://docs.travis-ci.com/user/reference/trusty/#container-based-infrastructure), `sudo: false` is no longed needed since Trusty.

Backport PDO-related changes from master to 3.0.x

Use a wrapped PDO Statement instead of a custom class for `pdo_sqlsrv` since `PDOSqlsrv\Statement` doesn't extend `PDOStatement` anymore.

[DBAL-2958] Replaced extension of \PDOStatement with a composition to avoid having to replicate the \PDOStatement interface in ResultStatement

Remove superfluous Configuration instance

A configuration instance is not strictly required by [DriverManager::getConnection](https://github.com/doctrine/dbal/blob/master/lib/Doctrine/DBAL/DriverManager.php#L139).

As an upside, it doesn't add an extra warning for people that use Psalm/PHPmd when starting off from the documentation example. As the Configuration class has an `@internal` block those tools threat it as the other meaning for `@internal`, as in class that is [internal to the library and not for public use](https://docs.phpdoc.org/references/phpdoc/tags/internal.html).