Merge pull request #630 from lucianobaraglia/master

Doc Fixes
Fixes #629.
"AssetConverter::convert()" has been updated to use "escapeshellargs"
fixes #627
signup action for advanced app template
Added authkey generation
Added signup link to frontend
implemented password reset
Fixes #632.
Fixed wrong class uses.
refactored helper organization.
fixed field type
added charset
Fixes #637.
Password input in advanced app signup [ci skip]