Removed screenshots thumbnails
Merge pull request #323 from beaufortfrancois/master

[analytics] Fixed trailing comma in manifest
Merge pull request #318 from beaufortfrancois/removeThumbnails

Removed screenshots thumbnails
Removed deprecated manifest file_handlers title
[filesystem-access] Bumped manifest version
[image-edit] Bumped manifest version
Merge pull request #324 from beaufortfrancois/removeTitle

Removed deprecated manifest file_handlers title