Merge branch 'hotfix/3562'

Close #3562
Merge branch 'hotfix/3562' into develop

Forward port #3562
Merge branch 'hotfix/db-composerfix' of git://github.com/ralphschindler/zf2 into hotfix/3563
Merge branch 'hotfix/3563'

Close #3563
Merge branch 'hotfix/3563' into develop

Forward port #3563
Merge branch 'hotfix/flash-messenger-default-render-botched' of git://github.com/mwillbanks/zf2 into hotfix/3566
Merge branch 'hotfix/3566' into develop

Close #3566
Merge branch 'feature/db-adapter-platform-options' of git://github.com/ralphschindler/zf2 into hotfix/3567
[#3567] Fixed CS

- Moved closing paren to next line for multi-line conditionals
Merge branch 'hotfix/3567' into develop

Close #3567
Correctly parse empty Subject header

Without this fix parsing an email with an empty subject header "Subject:" fails.

Fatal error: Uncaught exception 'Zend\Mail\Header\Exception\InvalidArgumentException' with message 'Invalid header line for Subject string' in library/Zend/Mail/Header/Subject.php:39
Allow to add serializers through config
Fix name of plugin referred to in exception message
Fixed escape breakline

the way it was printing:
    //<!--
    Some script in here...    //-->

and now:
    //<!--
    Some script in here...
    //-->
Fixed breakline to script with content

it was printing:
    <script type="text/javascrit">
        some content...</script>

now it is printing:
    <script type="text/javascrit">
        some content...
    </script>

this does not affect when there is no content, it still prints:
    <script type="text/javascrit"></script>
Removed unnecessary space
First commit of Zend\Db\Adapter\Profiler
Fixed an issue on salt check in Apache Password
Zend\Db Fix for #3290
- Zend\Db\Adapter\Platform\Mysql should have wider rage of possible identifiers in fragment quoting
Added the Apache htpasswd support for HTTP Authentication