Get jquery-ui file name back

[MOZGIII]

As long as you can control dependencies via gemspec and jquery-rails does no longer provide jquery-ui file, the upstream name can (and should) now be used.
Consider making an update providing jquery-ui aliased to jquery.ui.all.

[joliss]

Sounds good. We have a (currently superfluous) dependency on jquery-rails in the gemspec. We should make that dependency to require jquery-rails >= 3.0.0 so we don't collide with 2.x.

I'd love to get a pull request from you. (Add it to the changelog, but don't bump the version please.) Or if you don't get around to it, I'll do it next time I touch this gem.

[joliss]

I removed the dependency on jquery-rails in #55 because it was causing trouble for people.

If we used jquery-ui.js, we'd still have to ensure jquery-rails < 3.0.0 isn't loaded or we'd conflict with their version. But I don't believe there's a way to disallow "jquery-rails < 3.0.0" in the gemspec without re-adding jquery-rails as a dependency (which I don't want to do).

So as long as jquery-rails 2.x is still floating around, I'm not sure that we can use jquery-ui.js. We could maybe revisit this a year from now though.

[joliss]

jquery-ui.js has been brought back in #70, released in version 5.0.0. I've added a warning to the README so people know to check for incompatible jquery-rails versions.