Use link_to_blank_unless
Copy from actionpack
Use link_to_blank_unless
Copy from url_helper
Remove, because all method based on url_helper

actionpack/lib/action_view/helpers/url_helper.rb
Use link_to_blank_if
Copy from action_view
Use link_to_blank_unless_current
Copy from action_view
Copy request_for_url
Use link_to_blank_unless_current
Add readme helpers

About link_to_blank_if, link_to_blank_unless, link_to_blank_unless_current
Add signature for readme
Merge pull request #16 from sanemat/feature/link_to_blank_unless

Add link_to_blank_if, link_to_blank_unless, link_to_blank_unless_current