Merge branch 'master' of git://github.com/yiisoft/yii into 1201-cmenu-link-label-wrapper

Conflicts:
	CHANGELOG
Code optimizations.
Fixes #1281: ogg/ogv/theora/xiph mime types.
Fixes #1286 and #1184. Draft version.
Changelog and docblocks.
Removed support of the PECL idn library because it's not tested.
Merge branch 'master' of git://github.com/yiisoft/yii into 1183-db-command-where-append

Conflicts:
	CHANGELOG
Enh #486: CHttpSession::$gCProbability and CDbHttpSession::$gCProbability are floats now. Minimal $gCProbability value has been changed to the 0.001%, was 1% before, default value left unchanged (1%).
Language fixes.
Merge pull request #1123 from resurtm/556-mysql-column-comment

1.1.13, Enh #556: Added CDbColumnSchema::$comment which stores comment for the table column, comment retrieving is working for MySQL, PgSQL and Oracle.
MSSQL is not supported yet
Merge branch 'master' of git://github.com/yiisoft/yii into 486-http-session-gc-probability

Conflicts:
	CHANGELOG
Refinements and $gCProbability now can be 0.00000005% not just a 0.001%.
MSSQL tests: added support of the SQLSRV, tests actualized to the MSSQL Server 2008 R2 and latest framework version.
Requirements checker: added support of the MSSQL (pdo_dblib and pdo_sqlsrv extensions).
MSSQL driver types refinements.
CHANGELOG.
Requirements checker: added support of the Oracle database (pdo_oci extension)
Working draft of MSSQL column comments support.
Changelog.
Additional tests for CUrlValidator.