maybe fixing new bug where form doesn't update in `response_failure`?
configurable failure setting; should optionally attach to on-screen notification; GF attaches to all confirmations
* failure field is textarea, better description; * failure mask includes original message
failure message -- uses normal gf message if nothing specified; clearer description
Merge branch 'master' of https://github.com/zaus/forms-3rdparty-integration
readme(s) updated; removed debug from on_response_failure; using native `error_log` fn rather than `_log` if debug email fails