Polling interval field CSS update

As described in ticket: https://issues.apache.org/jira/browse/COUCHDB-2371

I also changed the slider event from onChange to onInput which continually fires when the user drags the slider. It results in more code being called but it has a much better feel, I think: i.e. the # seconds updates during dragging, not just afterwards. This was probably what was originally intended: Chrome changed the onChange event behaviour a few months back to only fire after the drag is completed.
My sublime-editor has a setting for it: `	"ensure_newline_at_eof_on_save": true,`

I also have a global pre-commit-hook in addition: https://github.com/robertkowalski/dotfiles/blob/master/.my-git-templates/hooks/pre-commit