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
typo fix in guide

fixes #3308
Remove async from list of Special Attributes so that it is possible to use async=false per issue: #3314
Merge pull request #3316 from wilwade/3315-issue-fix-async

Remove async from list of Special Attributes so that it is possible to u...
Fixed #3283
Fixed #3258
Merge pull request #3319 from nukkumatti/issue-3258

Fixed #3258
Merge pull request #3318 from nukkumatti/issue-3283

Fixed #3283
Better fix for <script async="false"
Fix #132: CDbConnection now supports ODBC
Add ODBC to the requirements checker
CDbConnection ODBC related fixes before merging
Merge pull request #3325 from resurtm/fixes-132-odbc-connection

Fix #132: CDbConnection now supports ODBC