Merge branch 'master' into 'stable-3.1'

Till Brehm

2016-05-19 dc7aa0813f52eed4eb039a21ee13d6a5cb7f104c

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ALTER TABLE  `sys_session` CHANGE  `session_id`  `session_id` VARCHAR( 64 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL;