Merge branch '5.1' into 5.2

* 5.1:
  Change in table creation SQL for SQL Server

Author: OskarStark

session/database.rst

@@ -428,7 +428,7 @@ Microsoft SQL Server
 
     CREATE TABLE sessions (
         sess_id VARCHAR(128) NOT NULL PRIMARY KEY,
-        sess_data VARBINARY(MAX) NOT NULL,
+        sess_data NVARCHAR(MAX) NOT NULL,
         sess_lifetime INTEGER NOT NULL,
         sess_time INTEGER NOT NULL
     );