various refactorings.

laravel/database/connectors/sqlite.php

@@ -30,6 +30,10 @@ class SQLite extends Connector {
 	{
 		$options = $this->options($config);
 
+		// SQLite provides supported for "in-memory" databases, which exist only for the
+		// lifetime of the request. Any given in-memory database may only have one PDO
+		// connection open to it at a time. Generally, these databases are use for
+		// testing and development purposes, not in production scenarios.
 		if ($config['database'] == ':memory:')
 		{
 			return new PDO('sqlite::memory:', null, null, $options);