CUBRID Database 9.0 Support.
Ref: converted spaces to tabs according to Yii coding conventions.
Ref: converted spaces to tabs.
Merge branch 'cubrid-database-support' of https://github.com/kadishmal/yii into kadishmal-cubrid-database-support

* 'cubrid-database-support' of https://github.com/kadishmal/yii:
  Ref: converted spaces to tabs.
  Ref: converted spaces to tabs according to Yii coding conventions.
  CUBRID Database 9.0 Support.
CUBRID copyright, version and indentation fixes

adjustments to PR #1893
Code style

adjustments to PR #1893
Allow sql files diff & preview in gii
Backport Request::getPreferredLanguage() from yii2
Eager loading note added to 'Relational Query Options' docs
'cli' mode detection at 'CConsoleApplication' fixed
Missing entries added to CHANGELOG
jquery.yiiGridView fixed to be able handling special chars if history is enabled
jquery.yiiListView fixed to be able handling special chars if history is enabled
Issue #3253 added to CHANGELOG
Issue #3253 corrected to #2519 at CHANGELOG
'summaryTagName' and 'emptyCssClass' options added to CBaseListView
'State.data.ajaxUrl' renamed to 'State.data.url'
'jquery.yiiGridView' and 'jquery.yiiListView' allows to handle all update options via history state data
Issue #3061 added to CHANGELOG
Merge pull request #3329 from klimov-paul/3297-relation-options-eager-loading

 #3297: Eager loading note added to 'Relational Query Options' docs