Merge pull request #1 from Xethron/date-fix

Bugfix: Set overview/header date field to null if not set
Merge pull request #2 from Xethron/stream-filter-fix

Fix typo in stream filter
Merge branch 'fix-attachment-encoding'
Catch exceptions from mb_convert_encoding and default to iconv
Fix control_spaces PSR error
Merge pull request #88 from Xethron/catch-mb_convert_encoding-exceptions

Catch mb convert encoding exceptions