after scrolling on directory page, when clicking on invitation link, dialog popin was not visible cause page scrolled automatically to top
on brand new 'thumbnail' tag :
- label of errors was not correctly displayed
- mandatory feature was badly checked
on 'ticker' tag :
- canvas of an empty ticker appeared briefly
- sometimes labels were not correctly initialized
Fixing display problem around the ticker bar.
Fixing #6029
Merge branch 'ney-bugs-20141105' into core-5.15.x
Making global CSS more dynamic around url() function.