Convert js engine cfs to lists immediately after config read

PR created per https://github.com/kripken/emscripten/pull/2943#issuecomment-61139238

There are listify calls all over the place in emscripten and I've found it pretty difficult to figure out what's going on. So this PR turns all appropriate config items into lists as soon as they are read from the config.

I'm currently running the 'other' tests. I'll then do 'sockets' and the core ones, and then declare myself done (unless you see these second two as being unnecessary).