jquery-ui-rails 5.0.0 compatibility

[stgeneral]

https://github.com/joliss/jquery-ui-rails/blob/master/History.md#500:

Rename jquery.ui..{js,css} to jquery-ui/.{js,css}

[oliviermilla]

+1 http://stackoverflow.com/questions/24575940/rake-assetsprecompile-misses-jquery-ui-rails-files

[mxie]

There are already PRs for potential fixes: #3251, #3248.

[seanlinsley]

Closing as a duplicate of #3247