Merge branch 'hotfix/release-2.2.3'

2.2.3 release
Updated upcoming php-zf2 conferences
Merge pull request #116 from basz/patch-1

Updated upcoming php-zf2 conferences
[#116] fix parse errors

- missing commas between array entries
- remove commented conferences; that's why we have version control
Merge branch 'hotfix/116' into develop

Forward port #116