Merge branch 'master' into develop
Import class
Improve Middleware
File cache and add Cache::exists api
Support hierarchy levels
Move ArgParser and Cryptor to Utility
Change Debug license
Change comment of Route
Import Class
Fix a eventemitter bug and combine 2 method
Fix Html::img bug
Change Middleware::next comment
Change Url::site return comment
Fix Config::parse return comment
Add Cli check and more comments
Add Utility comments
Add class comments
Upgrade EventEmitter
Fix EventEmitter extends
Improve PrettyException for Fiber error