better doc for UnsafeValidator::validateAttribute
added warning about appending autoloader

include path will be disable so use with care!
fixes #2638
[UK][Guide] fixing small typo
Merge pull request #2655 from yiiframework-com-ua/uk_docs

[UK][Guide] fixing small typo
Improved api docs of CDbMigration
Improved api docs of CDbMigration safe methods
Update finnish translation
Merge pull request #2667 from janisto/messages_fi_update-2

Update finnish translation
fixes #2650: updated blog tutorial to use CPasswordHelper
fixes #2651: CHttpSession wasn't using GC probability/divisor from php.ini
Fix erroneous language attributes in finnish views
Merge pull request #2669 from janisto/messages_fi_update-3

Fix erroneous language attributes in finnish views