Rails4: db migrate: replace "Permission.find_by_controller_and_action"

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012422
Rails4 compatibility of Setting model

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012423
fix svn raw diff failure on svn version 1.6.17 (revision 1128011)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012424