angular-resource breaks IPv6 URLs

[c2franz]

There is a regular expression in angular-resource.js that is breaking IPv6 resource URLs:

url = url.replace(new RegExp("(\/?):" + urlParam + "(\\W|$)", "g"), function(match,
    leadingSlashes, tail) {
  if (tail.charAt(0) == '/') {
    return tail;
  } else {
    return leadingSlashes + tail;
  }
});

Example:
http://jsfiddle.net/c2franz/pszLs0kg/4/

Expected behavior: a GET request is performed to http://[2620:0:861:ed1a::1]
Observed behavior: a GET request is performed to http://[2620:0:861::1]

[lgalfaso]

This looks like a real bug. PR welcome.