Bumps ch.qos.logback:logback-classic from 1.5.22 to 1.5.26.

• 33deb54 prepare release 1.5.26
• d38a3e2 refactoring based on usage in logback-access
• 4368333 move VersionUtil.getCoreVersionBySelfDeclaredProperties to CoreVersionUtil
• 8bd5660 modify VersionCheckTest to use logback-core 1.5.25
• 7a8f0b6 version information is self declared by modules.
• 00d272f Do not use javax.naming namespace in the catch block, so that Logback can be ...
• 420d67c mention country only, add missing 2016-03-29
• 033aba4 fix javadoc errors
• 6d52744 start work on 1.5.26-SNAPSHOT
• f426e00 prepare release of 1.5.25
• Additional commits viewable in compare view