[release] Prepare XE 1.5RC1 release.
[release] Prepare XE 1.5RC1 release.

git-svn-id: d9432c2fa93ea23b2ec386593d51496f52b99806@11141 f329d543-caf0-0310-9063-dda96c69346f

pbondoer/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform