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
Added check for the existence of a link href attribute pager
Added check for the existence of a link href attribute pager
Add changes #3298 to CHANGELOG
Merge pull request #3298 from dutchakdev/hotfix-3295

Added check for the existence of a href attribute in link pager
Update yii.php

Without word "Atrybut" (english "attribute") this phrase is grammatically incorrect when noun representing field name isn't masculine (e.g. "Hasło musi być powtórzony" should be "Hasło musi być powtórzone". "Hasło" means english "Password"). 
Also, I added missing word "exactly" (polish "dokładnie") and removed word "ponownie" (this is pleonasm http://en.wikipedia.org/wiki/Pleonasm)
Merge pull request #3299 from winiarekk/patch-2

Update yii.php
COciSchema: read column comments from another schema
Merge pull request #3305 from gureedo/oci_comments

COciSchema: read column comments from another schema
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