FEC-2230 uglify build

* restore "JSON" to resource list ( needed in loader )
* check for min version in mwEmbedLoader.php output
* check for min version in resourceLoader file module
* add public methods to Resource File Module to get a module list
* add wgNodeJsUglifyPath var to define jsUglify path
* ignore the /build path in git check-in
this synax error was being caught by our builds