Throw exception if file not exist
Check file before delete
Update error messages for file delete
Fix file absolute path
Added file check for download
Add blocks for comment module
Back wrong remove
Merge pull request #1217 from voltan/develop

Add blocks for comment module
Set template capture value explicitly
Typo fixes
Added support for context in template so that module/component css files have hight priority than layout css
Merge branch 'develop' of https://github.com/pi-engine/pi into develop
Fixed bug of context in template