incorrect IE prefix when converted to css property

[flexphperia]

In uncamel function used to convert a camelcase string to a dasherized string there is a bug.
When css property is prefixed with IE prefix "ms" this function should convert it like this:

from this:
msTransform
should be this:
-ms-transform
now is this:
ms-transform

We have:

function uncamel(str) {
  return str.replace(/([A-Z])/g, function(letter) { return '-' + letter.toLowerCase(); });
}

Should be:

function uncamel(str) {
  return str.replace(/([A-Z])/g, function(letter) { return '-' + letter.toLowerCase(); }).replace(/^ms-/,'-ms-');
}