To install the
responsive-layout branch of Hoplon:
git clone https://github.com/hoplon/hoplon.git
git branch --track responsive-layout-attributes origin/responsive-layout-attributes
git checkout responsive-layout-attributes
That will install a build of
[hoplon/hoplon "6.0.0-alpha13"] to your local Maven repository at
~/.m2. To use this build of Hoplon in your project, just depend on that version. Maven will find the artifact locally and will not fetch the actual, mainline artifact from Clojars.
As for your second question -- does ui subsume garden/CSS -- I believe this is a goal of the project. Maybe @jumblerg could shed more light, as author.