updated sentinel submodule
Modify regexes to handle non ascii form names. Issue: #466
Be more careful when determining if a form is compact or not. Now non-compact submissions must have a field label followed by whitespace. Issue: #552
Non-compact form submissions are allowed to have whitespace or a number directly following the label. Issue: #552
Non-compact form submissions are allowed to end the message with a field label. Issue: #552
Parse a message containing only a form code as a form with no content. Issue: #551
Merge branch 'develop' into inbox-design