XWIKI-10355: Clear the LESSSkinFileCache when a Color Theme is created or modified.
XWIKI-10343: Generate the CSS file for Flamingo at runtime.
XWIKI-10355: Clear the LESSSkinFileCache when a Color Theme is created or modified.

* Now also take care of the current skin.
 XWIKI-10356: Remove the "done" message displayed on the logs when LESS compiler is used.
XWIKI-10358: Compress LESS generated files.
XWIKI-10359: Unable to change the logo via the XWiki UI.