added dblib option to sqlsrv connector class /sam fitz (abigwonderful)

simple conditional added to look for dsn type. if set and is dblib,
syntax for PDO connection adjusted slightly to allow for mac connection
to mssql server (utilizing freetds)

laravel/database/connectors/sqlserver.php

@@ -29,7 +29,15 @@ class SQLServer extends Connector {
 		// directly after the server name, so we'll create that first.
 		$port = (isset($port)) ? ','.$port : '';
 		
+		//check for dblib for mac users connecting to mssql (utilizes freetds)
+		if (!empty($dsn_type) and $dsn_type == 'dblib')
+		{
+			$dsn = "dblib:host={$host}{$port};dbname={$database}";
+		}
+		else
+		{
 			$dsn = "sqlsrv:Server={$host}{$port};Database={$database}";
+		}
 
 		return new PDO($dsn, $username, $password, $this->options($config));
 	}