Merge pull request #431 from nlegoff/fix_JS_issue

[3.8] Remove jquery ui-widget as it is already include with jquery ui
Add File Serve Factory as a service
PR's comments adressed

Remove pragma header

Remove extra line

PR'S comments adressed

Fix CS

PR's comments adressed

Remove seless tests
Add logger
Use power of symfony binary file response

Add commands

Fix typo

Remove extra line
Explicitly set HTTP cache to public when delivering thumbnail
Rename subscriber