Update scroll and sale in activate view.

Fixes #939
removed unused javascript. Fixes #998
Merge pull request #1012 from ostcar/issue_998

removed unused javascript. Fixes #998
Merge pull request #1005 from ostcar/activate_view

Update scroll and sale in activate view.
Add correct wxpython version to PACKAGES.txt (fixes #821)
Show default_slide if an error occurs in a slide

See #925
Fixed #897 (Use correct server time for clock/countdown on other clients)
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).
Merge pull request #1018 from emanuelschuetze/fix957

Extend css style optinos in CKEditor
add missing license html6lib-python