Added SQLite migration, schema and foreignKey support.

Made all tests SQLite compatible and added sqlite to travis buildsuite.
Made phpunit.*.sh scripts since the phpunit call differs.
Added `getSchemaDelimiter` method to Platform classes and use it everywhere.
Connection->query returns now also a StatementWrapper object.
Added sqlite fix for rowCount on SELECT statements.
Merge pull request #433 from marcj/add-sqlite-migration

Added SQLite migration, schema and foreignKey support.