Add KSS javascript to handle CSS pseudo classes
user
```coffeescript
# Scans stylesheets for pseudo classes, then inserts a new CSS rule with the
# same properties, but named 'psuedo-class-{{name}}'.
#
# Supported pseudo classes: hover, disabled, active, visited, focus, checked.
#
# Example:
#
#   a:hover { color: blue; }
#   => a.pseudo-class-hover { color: blue; }

pseudos = /(\:hover|\:disabled|\:active|\:visited|\:focus|\:checked)/g

try
  for stylesheet in document.styleSheets
    idxs = []
    for rule, idx in stylesheet.cssRules
      if (rule.type == CSSRule.STYLE_RULE) && pseudos.test(rule.selectorText)
        replaceRule = (matched, stuff) ->
          return ".pseudo-class-" + matched.replace(':', '')
        @insertRule(rule.cssText.replace(pseudos, replaceRule))

insertRule: (rule) ->
  headEl = document.getElementsByTagName('head')[0]
  styleEl = document.createElement('style')
  styleEl.type = 'text/css'
  if styleEl.styleSheet
    styleEl.styleSheet.cssText = rule
  else
    styleEl.appendChild(document.createTextNode(rule))
  headEl.appendChild(styleEl)
```
assistant