Add upscale filter
Fix typo
Update doc
Merge pull request #248 from maximecolin/master

Add Upscale filter
Add comment for image parameter in watermark filter configuration example
Merge pull request #263 from USvER/patch-1

Add comment for image parameter in watermark filter configuration exampl...
Update filters.md

The dynamic filters need a custom controller action, not a custom data loader ...
Merge pull request #267 from uwej711/patch-1

Update filters.md
add test on cyrillic filename for FileSystemLoader