hide feedback matching "n0"
add tests for hiding "n0" and showing two-digit numbers
Merge pull request #175 from caktus/hide-feedback-n0

Hide feedback matching "n0" (zero) and make sure two-digit feedback is shown (per Lauren)
allow manually hiding feedback. refs #166
fix typo in test data
add help text for display_on_dashboard field
Merge pull request #176 from caktus/manually-hide-feedback

allow manually hiding feedback. refs #166
Merge branch 'develop' into report_part_box