Log Message:
Update to 4.5.5

Changelog:
Version 4.5.5 Dec 20th 2012

    Show drag and drop shadow for Firefox
    Fix Knowledgebase under certain conditions
    Fix setting of sharing password
    Fix setting of sharing password
    Several sharing fixes
    Fixversioning during sharing
    Fix mounting of external filesystems especially CIFS
    Fix several PHP warnings
    Show /Shared as standard directory
    Fix session management for running several ownClouds on the same host
    Fix WebDAV quota enforement
    Fix CalDAV with LDAP users
    Better warning about missing dependencies
    Add warning about conflicting WebDAV auth and LDAP backend
    Restore send sharing link my email
    Fix encoding problem with mounting of CIFS filesystems
    Fix mimetype icons for new files
    Fix the folder size calculation
    Fix for deleting multiple files
    Fix for controling the data dir with LDAP
    Security: Auth bypass in user_webdavauth and user_ldap (oC-SA-2012-006)
    Security: XSS vulnerability in bookmarks (oC-SA-2012-007)