Examples for ElmButton, ElmList, ElmGenList

Since it took me a while to figure some things out, I created a few more examples.

Could the ElmGenItemClass needed for GenLists be put into the library?
I don't really understand the generation process, are there parts of the lib/ that are not generated? (Couldn't get genruby.rb to work quite right yet. Will retry that with efl installed from install-efl.sh.)