Fix IMAP connection issue with default_socket_timeout < 0 and imap_timeout < 0 (#1489090)
Fix format=flowed text re-wrapping for display
Fix handling of invalid email addresses in headers (#1489092)

Conflicts:

	CHANGELOG
	program/steps/mail/func.inc
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
Catch warning on is_readable() failure (open_basedir restriction)
Fix another text wrapping issue (wrong handling of long unwrappable lines)
Fix fatal error when parsing UUencoded messages (#1489119)

Conflicts:

	CHANGELOG
Fix browser warnings on PDF plugin detection (#1489118)
Fix displaying contact with ID divisible by 100 in sql addressbook (#1489121)
Fix invalid option selected in default_font selector when font is unset (#1489112)
Print nicer error message when too old PHP version found - required by mysql driver (#1489099)
Fix PHP warning in html_table::set_row_attribs() in PHP 5.4 (#1489094)
Fix fatal error when xdebug.max_nesting_level was exceeded in rcube_washtml (#1489110)