adding remember-me to url-authentication

I think the url-authentication feature is very useful and I've started using it for Omniauth authentication.

It would be very useful if url-authentication allowed remember-me because I think it is more natural for Oauth users not having to authenticate each time and also because in this way, the page can be reloaded if needed and one can possibly get rid of the auth token on the url which is a security concern.

I'm very sorry that I haven't tested this feature because I get this message when I try to run the application to test: `raise_if_conflicts': Unable to activate ember-source-0.0.5, because handlebars-source-1.0.9 conflicts with handlebars-source (< 1.0.0.rc4, >= 1.0.0.rc3) (Gem::LoadError) Maybe I'm not doing what is needed to test.