Fixed typo
Update xhr_url_for.rb

Allow url_for to still be called with no parameters, just like the one we're overriding.
Merge pull request #339 from larspind/patch-1

Allow url_for to still be called with no parameters
Merge pull request #337 from pborreli/patch-1

Fixed typo
Refactor click handling, link checking, and url parsing into classes; ensure absolute urls used for cache keys and state objects.