Ensure prefer_form_input_filter is set to true for the generated form
Merge branch 'hotfix/annotation-builder-prefer_form_input_filter'

Close #309

See zendframework/zf2#5479

Compatibilizes with zendframework/zf2:~2.2.4, which uses `prefer_form_input_filter` by default
remove unused statement
Merge pull request #311 from mpalourdio/unused

remove unused statement