DbManager some Db fields renaming
Merge pull request #212 from creocoder/db-auth-manager-enh

Suggest \yii\rbac\DbManager some Db fields renaming
RBAC sql files
Merge pull request #219 from creocoder/rbac-sqls

RBAC sql files
RBAC sql files identation fix
Merge pull request #220 from creocoder/rbac-sqls-identation-fix

RBAC sql files a little identation fix
Add exception classes hierarchy UML diagram.
Added autoload classmap
Merge branch 'master' of git://github.com/yiisoft/yii2 into 123-add-composer-autoload-section