Merge branch 'master' into 'stable-3.1'

Till Brehm

2016-04-22 4ae3b94bce6b2f26002c1a50247a01ab4cf2219a

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