Parse config for Yii aliases

[timkelty]

Would be nice to be able to use @web/@webroot

http://www.yiiframework.com/doc-2.0/guide-concept-aliases.html

[scottwakefield]

@timkelty, as mentioned on Slack, this is now supported in the latest version found at: https://github.com/clubstudioltd/craft-asset-rev 👍