Use location.href to extract hash

There is a bug in firefox which means that location.hash contains the decoded URL. e.g

if the url is 

xxx.com/#link/http%3A%2Fwhy.com

Then:

location.hash will be: #link/http://why.com
and
location.href will be: xxx.com/#link/http%3A%2Fwhy.com

So location.href contains the correct value but location.hash does not since it contains the decoded value. The fix is to use location.href to extract the hash.

More details on this page:
http://stackoverflow.com/questions/1703552/encoding-of-window-location-hash

;(function(riot, evt) {

  // browsers only
  if (!this.top) return

  var loc = location,
      fns = riot.observable(),
      win = window,
      current

  function hash() {
    return loc.href.split('#')[1] || ''
  }

  function parser(path) {
    return path.split('/')
  }

  function emit(path) {
    if (path.type) path = hash()

    if (path != current) {
      fns.trigger.apply(null, ['H'].concat(parser(path)))
      current = path
    }
  }

  var r = riot.route = function(arg) {
    // string
    if (arg[0]) {
      loc.hash = arg
      emit(arg)

    // function
    } else {
      fns.on('H', arg)
    }
  }

  r.exec = function(fn) {
    fn.apply(null, parser(hash()))
  }

  r.parser = function(fn) {
    parser = fn
  }

  win.addEventListener ? win.addEventListener(evt, emit, false) : win.attachEvent('on' + evt, emit)

})(riot, 'hashchange')


;(function(riot, evt) {

  // browsers only
  if (!this.top) return

  var loc = location,
      fns = riot.observable(),
      win = window,
      current

  function hash() {
    return loc.hash.slice(1)
  }

  function parser(path) {
    return path.split('/')
  }

  function emit(path) {
    if (path.type) path = hash()

    if (path != current) {
      fns.trigger.apply(null, ['H'].concat(parser(path)))
      current = path
    }
  }

  var r = riot.route = function(arg) {
    // string
    if (arg[0]) {
      loc.hash = arg
      emit(arg)

    // function
    } else {
      fns.on('H', arg)
    }
  }

  r.exec = function(fn) {
    fn.apply(null, parser(hash()))
  }

  r.parser = function(fn) {
    parser = fn
  }

  win.addEventListener ? win.addEventListener(evt, emit, false) : win.attachEvent('on' + evt, emit)

})(riot, 'hashchange')
