change captcha if it's validated.
changed parameter ordering.
Fixed a bug about enabling trace with profiling.
debugger wip
debugger WIP
Merge pull request #2 from yiisoft/master

Merge from yiisoft/master
Invert the condition in AssetConverter
Merge pull request #607 from DsXack/master

Fix the condition in AssetConverter
initial implementation of Yii debugger.
Merge branch 'master' of github.com:yiisoft/yii2
minor issue fixes.