[neko.ui] Accept already created objects in make-ui-element
[neko.ui] Restore default attributes functionality
[neko.ui] Add :custom-constructor attribute
Update .gitignore
[n.u.traits] Add common :layout-margin attribute
Setup thread factory from Neko (deprecate custom nREPL build)

Redef clojure.tools.nrepl.middleware.interruptible-eval/configure-thread-factory
as described at http://dev.clojure.org/jira/browse/NREPL-8.