Add injury attribute to Incident model. See #1
Validate severity range and test for it. See #1
Add textual explanation of severity level and use constants. See #1
Add severity in controller strong params and form. See #1
Add useful error message for out of range severity. See #1
Return unknown severity string instead of raising exceptions. See #1
Display severity level text on show and index. See #1
Update input to be HTML5 rangeinput with jquery severity_text helper below. See #1

Polyfill for HTML5 rangeinput should be used... Coming soon
Add colours to severity text in form. See #1
Colorize severity text in index and show. See #1
Merge pull request #17 from f3ndot/issue-1-injury-severity-slider

Add colourized severity slider with descriptive text. Fixes #1