Fix problem where security warning was displayed for valid images with image/jpg type (#1489097)
Bump version for next release
Add composer.json template in preparation for the new plugin repository
Update localizations from Transifex
Bump version number here too
Small fix to the printed debug message
Better German labels for from/to headers to avoid conflicts with 'sender' (#1489084)
Add 0.9.1 to releases list
Merge branch 'release-0.9' of https://github.com/roundcube/roundcubemail into ipax-0.9