Add correct wxpython version to PACKAGES.txt (fixes #821)
Show default_slide if an error occurs in a slide

See #925
Merge pull request #1013 from ostcar/SlideError

Show default_slide if an error occurs in a slide
Merge pull request #1016 from emanuelschuetze/fix897

Use correct server time for all clients
Merge pull request #1015 from andkit/fix-821

Add correct wxpython version to PACKAGES.txt (fixes #821)
Fixed #957 (Allow list-style in CKEditor)

Allowed additional css styles 'color' and 'background-color'
for span html fields in ck-editor (and bleach).